Outstanding parity work

Status reviewed on 2026-10-03. The original six workstreams below are historical foundations; later sections record the subsequent features and their limits. The parity roadmap gives the current baseline, next priorities and evidence required for Word equivalence. No full Word parity is claimed; model warnings identify unsupported imported content.

Merged workstreams

Workstream	What landed
Numbering and lists	numbering.xml catalog, style-inherited numPr, computed labels (decimal, Roman, letter, ordinal, cardinal/ordinal text, bullet, legal, multilevel lvlText), list commands, Enter-on-empty exits a list, Tab/Shift+Tab levels, numbering part surgery on save.
Sections, breaks, headers/footers, notes	DocumentModel.sections; editable page/column breaks and pageBreakBefore (Ctrl+Enter); read-only headers/footers and footnotes/endnotes.
Pagination / Print Layout	ooxml-core/docx/layout engine (line breaking, spacing, indents, widow/orphan, keep rules, table row splitting, columns) and a read-only paginated Print Layout view with printing, driven by the section model.
Tracked changes and comments	Revisions on runs and paragraph marks, markup display modes, accept/reject (one/all), next/previous, Track Changes mode, comments pane with replies and resolve, comments.xml writing.
Theme, character styles, tables	Theme colors/fonts, character styles with toggle-property inheritance, extra run properties (caps, small caps, double strike, underline style/color, spacing, shading, hidden text), table grid/widths/merges/borders/shading/table styles.
Pictures, hyperlinks, bookmarks	Inline pictures rendered from package media, floating/unsupported drawings as placeholders, hyperlink targets (relationships, anchors, simple HYPERLINK fields), read-only bookmarks preserved across edits.

Fixes made during integration

• Track Changes mode applied each edit twice; the tracked replacement now replaces the original step.
• New hyperlink/image relationships could reuse an id declared only in document.xml.rels (for example the styles relationship).
• Comment reference runs were parsed as text and duplicated on every save.
• Editing text dropped character styles, caps and theme colors (and then stripped them on save); editing a simple table dropped its grid, borders and style.
• Pictures had no image source in the editor; imported javascript: link targets were rendered as live hrefs.

Remaining gaps

Imported equations

Inline and display OMML equations render as read-only MathML in the editing surface and story previews, with accessible equation labels. Conversion lives in the shared ooxml-core/math area. Unsupported previews show a notice rather than silently disappearing. Source OMML stays intact while neighboring text changes; save/reopen browser contracts cover all six bindings. Equation insertion and editing are not supported. Print Layout shows [Equation] and an approximation warning; native MathML display does not establish Word layout parity.

Editor commands and UI

Toolbar and context-menu clipboard commands now use supported HTML when the browser clipboard API provides it, preserving schema-supported formatting, links, paragraph boundaries and tables. Copy/Cut fallback writes HTML and plain text together; a denied write or a changed selection never deletes content. Plain-text-only APIs remain supported. External HTML is not an OOXML preservation format, and unsupported styles, drawings and equation metadata are not promised to survive clipboard transfer.

Table > Properties edits selected cells' vertical alignment (Top, Center or Bottom), with mixed selections left unchanged and a default option that removes direct overrides. Alignment applies with the other properties as one undoable edit. Save/reopen keeps unrelated imported cell XML. Merged and complex tables remain protected.

Print Layout clicks now use fragment source ranges and displayed glyph boxes instead of distributing offsets across the entire column. Centered/indented short lines and scaled formatting runs map to the visible text boundaries; grapheme boundaries avoid splitting surrogate pairs or combining sequences. This improves click-to-cursor in the continuous editor, not editing directly on pages. Mixed-direction text and placeholder-to-model offsets still require broader coverage.

Done since the merge: per-section page setup and section breaks (undoable), in-place header/footer and footnote/endnote editing, Insert Footnote/Endnote (creating the notes part when needed), headers/footers with live PAGE/NUMPAGES in Print Layout, table style rendering, picture resize and alt text, Word-style window chrome (title bar with quick access, "Tell me" command search, Editing/Viewing mode; File backstage; status bar with zoom and compatibility notes), Insert Picture (PNG, JPEG, GIF, BMP, and SVG with a PNG fallback), insert/edit/remove hyperlink with Ctrl+K and a "Place in this document" bookmark list, Ctrl+Click to follow links, a character style picker, inherited run formatting and theme fonts/colors rendered in the editor, and a hidden-text toggle. Fields are editable (complex fldChar/instrText and fldSimple): the result text edits in place and the field structure is kept. A References tab has Table of Contents and Update Table: entries come from heading styles (\o levels), and page numbers come from Print Layout pagination. Paragraph tab stops (w:tabs) are modeled and saved, and Print Layout honors them (alignment and leaders), along with paragraph indents and list labels.

Still missing:

• Section editing covers size/orientation, margins, columns, vertical alignment, all four section-break types, a different first page, page numbering and the document-wide odd/even headers setting and line numbering (Layout > Line Numbers: none, continuous, restart each page or section, plus Line Numbering Options for count-by, start and automatic/custom distance from text; numbers are drawn in Print Layout only, with per-paragraph suppression in the menu and Paragraph dialog, including style inheritance and explicit offs. Tables are excluded. The model uses visible start numbers and converts Word's zero-based w:start at the package boundary); Layout > Page Borders sets a section's w:pgBorders (None, Box or Custom sides, one pen of single, double, dotted, dashed or thick, width, colour, distance, measured from the page edge or the text, shown on all pages, the first page or all but the first; undoable). Print Layout draws them; the continuous editing surface has no pages, so it does not. Imported art borders (w:art) are read, kept when untouched, drawn as plain lines, and replaced by a plain pen if the dialog is applied to that side; per-side pens, in-front/behind and Apply-to-document scopes are not offered, and the border is not clipped around headers and footers. The continuous surface shows columns only for single-section documents (Print Layout shows all); vertically justified sections lay out top-aligned.
• Ctrl+Alt+F / Ctrl+Alt+D (insert footnote/endnote) are bound, but Windows browsers can report Ctrl+Alt as AltGr and not deliver them; the References ribbon buttons always work.
• Table of contents entries link to _Toc bookmarks on their headings with PAGEREF page numbers, as Word writes them. TC fields and custom style mappings (\t) are not collected. Tab stops are saved and honored in Print Layout and on the editing surface (measured after rendering, with leaders); the implicit hanging-indent stop is applied in Print Layout only.
• Pictures and links in headers, footers and notes are resolved, shown and saved with each part's own relationships; while a header, footer or note is being edited, the ribbon (formatting, Insert Picture, Link) targets it.
• Tables: default cell margins (tblCellMar) and row properties (height with its rule, keep-together, repeat-as-header) are modeled and render in both views; Print Layout clips exact-height rows and repeats header rows. Table > Properties now edits these settings for rectangular tables, with mixed selected rows, validation and one-step undo. Row properties follow surviving rows during structural edits. Opened DOCX packages save changes to these fields while preserving unrelated table XML. Merged/nested/complex tables remain protected. Table > Properties also edits selected-cell margin overrides, with mixed values left blank and only changed sides applied. Use table defaults removes the selected cells’ direct overrides. Row settings, table defaults and cell overrides apply together as one undoable edit; imported widths, borders, shading and extension XML remain preserved on save/reopen. Missing override sides inherit the live table defaults in both views, including explicit zero overrides. Exact-height rows are a minimum on the continuous editing surface and clipped in Print Layout.
• Paragraph borders (w:pBdr, with w:space and grouped between lines) and shading render in both views from direct formatting and styles. Home offers presets and a Borders and Shading dialog; art borders remain missing. In a rectangular table the Home Borders menu (including Inside vertical) and the dialog's Apply to Cell or Table draw per-cell edges (w:tcBorders): the selected cells' rectangle, one pen, the shared edge on the neighbouring cell updated too, one undo step. Existing cell XML keeps its other sides, untouched shading and width; only changed sides are rewritten. Merged/nested/complex tables stay protected; table-level w:tblBorders and table styles are not edited (cells override them), pen per side, diagonal borders and a preview are not offered. Cell and Table scope now offer a solid fill or No Color, applied together with borders in one undo step. Mixed fills are left untouched unless changed; No Color explicitly overrides inherited table-style fills. Imported pattern and theme shading is preserved until its fill is edited, when it becomes a solid fill, and a cleared edge is written as an explicit none rather than removed. Automatic, nil and percentage table/cell widths are no longer interpreted as fixed twip widths, so automatic-width tables do not collapse after saving and reopening; their original width XML stays preserved.
• Paragraph keep options (keepNext, keepLines, widowControl, contextualSpacing) are modeled from styles and direct formatting, preserved through editing and used by Print Layout pagination (headings stay with the next paragraph). The Paragraph dialog exposes these settings, including mixed selections.
• Toggle properties follow ECMA-376: explicit offs (w:val="0", w:u w:val="none") are kept and cancel styles, styles inherit through basedOn and XOR across style types, and direct formatting is absolute. Bold, Italic, Underline and Strikethrough toggle what the text shows, writing an explicit off for style-inherited formatting as Word does (with a selection; a collapsed caret toggles the typing marks).

Ribbon parity with Word

Every tab uses Word's layout language: SVG icons, large stacked buttons, inline icon-and-label buttons, dropdown commands (a transparent native <select> over an icon, caption and caret, so select.value and assistive technology keep working), split colour buttons with swatch popovers, editable font family and size combo boxes, a Styles gallery of preview tiles, group dialog launchers, contextual tabs, and one baseline for group captions. Toggle buttons reflect the selection (alignment, lists, bold and the rest), disabled controls look disabled, and tooltips carry the shortcut ("Bold (Ctrl+B)"). A Word command is shown only where a real command exists.

The File tab follows Word's backstage: Info (file name and save state, compatibility notes, tracked-change and comment counts, and a properties panel of words, characters, paragraphs, tables, sections, page size and orientation), New, Open, Save, Save As (takes a file name and keeps the opened format), Print, Export (PDF through the print dialog, DOCX, plain text) and Options (display language, theme, review author). Home now shows the current file and local New/Open/Export actions. Options also controls spelling, ruler, paragraph marks and page thumbnails through the live editor settings. The backstage traps keyboard focus and restores the focused control or document selection on close. Options apply to this editor session and are not persisted. Not implemented: recent files, Share, Account, Close, Protect Document, Version History, and the page count on Info (pagination is a Print Layout result). Info edits Title, Subject, Author, Tags and Comments (docProps/core.xml, created when missing; other elements such as created/modified dates are kept untouched, and the last-modified fields are not updated on save). Edits mark the document dirty but are not part of undo history.

What each tab offers that Word also has:

• Home: Paste, Cut, Copy (disabled without a selection), Format Painter (character formatting only), font family and size combo boxes showing the effective font (styles and theme included), Grow/Shrink Font, Change Case, Clear Formatting, Bold through Superscript, Text Highlight, Font Color, lists and levels, indents, Sort (paragraphs, locale collation, numbers as numbers), Show/Hide paragraph marks (¶ only), alignment, Line Spacing, Shading and Borders (written to w:shd and w:pBdr, plus a Horizontal Line), a Styles gallery with previous/next/more controls, an expanded gallery of recommended paragraph and character styles with Clear Formatting, and a docked Styles pane listing every style; Find (with Go To headings, bookmarks, tables and pictures), Replace, and Select (All, Objects). The Font and Paragraph launchers open real dialogs: Font (family, style, size, colour, underline style and colour, strikethrough, double strikethrough, super/subscript, small and all caps, hidden, character spacing, with a preview) and Paragraph (alignment, indents, first-line/hanging, spacing, line rule and amount, contextual spacing, widow/orphan, keep with next, keep lines, page break before). Both apply only the fields you changed and show mixed selections as blank or indeterminate.
• Insert: Text boxes in an opened document (wps:txbx, including ones inside mc:AlternateContent) show their text read-only in a boxed placeholder on the editing surface and are kept byte-for-byte on save. Insert > Text Box adds an inline box (text lines, width, height, optional outline; wp:inline with wps:wsp, which Word opens as a shape with the same text); selecting the box and choosing Text Box again edits it. Only this simple form is editable (plain paragraphs of plain runs, not floating), including such boxes read back from a saved file; Word-authored, formatted, floating or mc:AlternateContent boxes stay read-only and untouched. Boxes are inline only (no wrapping or floating), have no per-run formatting, and Print Layout does not draw them (it says so). Drop Cap (Dropped or In margin, with font, line count and distance options: the first letter moves into its own w:framePr paragraph as in Word; the editing surface floats it, while Print Layout folds it into the next paragraph as a raised initial with a warning), Table (a size grid with keyboard control and typed rows and columns), Cover Page (one plain design), Pictures, Format picture, Link, Bookmark (add, move, delete, go to, Word's naming rule), Blank page, page and column breaks, Header, Footer and Page Number (creates the part, relationship, content type and sectPr reference on save, for existing packages and new documents), Date and Time (inserted as text in the display locale, not an updating field) and Symbol (27 common glyphs, not the full Symbol dialog).
• Watermark (Layout): a text watermark in the headers, as Word's Printed Watermark: text (with presets), font, colour, Diagonal or Horizontal, Semitransparent, or none. It is Word's PowerPlusWaterMarkObject VML shape in the header paragraph (Word COM reads it as a watermark with the same text, 315° rotation and 50% transparency), set in the first section's default header (created if missing) and every other header story the document has, as one undoable edit. Existing Word watermarks are read as a labelled "Watermark" run, kept byte-for-byte while the header text changes and replaced when the dialog applies. Print Layout draws a centred, rotated layer behind the text; the editing surface shows only the labelled run in the header preview. Picture watermarks, size and scale options, per-section watermarks and the exact Word glyph fitting are not offered (the layer's font size is an estimate).
• Layout: a Page Setup dialog (custom margins, gutter, header and footer distances, orientation, paper size and custom width and height, validated so text keeps room), Margins (Normal, Narrow, Moderate, Wide), Size (Letter, Legal, Tabloid, Executive, A3, A4, A5, B5), Orientation, Vertical alignment, Columns (One, Two, Three, Left and Right; More Columns edits count, equal or individual widths, spacing and separator lines, validates available width, targets the current section and supports undo), page-number format and start, different first page, odd and even, section breaks, Page Color (the colour picker; written as w:background with displayBackgroundShape, drawn on the editing surface and in Print Layout, not printed, and undoable; theme and gradient page fills are not modeled), Indent Left/Right (inches) and paragraph Before/After spacing.
• References: Table of Contents (levels 1-3, 1-2 or 1-5, or Remove), Add Text (heading levels 1-3), Update Table, Insert Caption (a SEQ field; every caption of a label is renumbered when one is added, and the Caption style is used when the document has one), Cross-reference (REF or PAGEREF fields to headings, bookmarks and captions; hidden _Ref bookmarks are added as needed), Table of Figures (TOC \h \z \c "Figure" for Figure, Table or Equation captions: entries are the captions with Print Layout page numbers and links to _Toc bookmarks, rebuilt by Update Table of Figures; custom \t style mappings and \a are not collected), Update Fields (renumbers every SEQ caption, then refreshes REF and PAGEREF results from their bookmarks and Print Layout pages, then rebuilds the table of contents and any tables of figures; the field changes are one undo step, each table rebuild is its own; fields with other switches such as \n, \r, \w or \p, and fields whose bookmark is missing, are left as they are; it is a command, not automatic on edit), Footnote and Endnote.
• Review: Spelling (toggles the browser's spell checker; no bundled dictionary or grammar checker), Word Count (selection or document), Read Aloud (the browser's speech synthesis), tracked-change commands, comments (New, Delete, Previous, Next, Show), and the language and direction controls.
• View: Ruler (inch ticks from the left margin, shaded margins and the current paragraph's indent markers; drag a marker to change the paragraph's indents, snapped to sixteenths of an inch and undone as one step; margin edges and tab stops are not draggable), Hidden text, Gridlines, thumbnails, Navigation pane (body headings, inherited heading styles, collapsible hierarchy, keyboard navigation, current-heading selection and live refresh; also works in Viewing mode), Zoom, Zoom to 100%, One page, Page width and Print Layout.
• Table (contextual): appears only while the selection is in a table, as in Word. Properties opens row height (At least/Exactly), Allow row to break across pages, Repeat as header row, default cell margins and selected-cell overrides in inches. Row settings apply to selected rows; cell margins apply to selected cells. Untouched mixed overrides remain intact; Use table defaults clears direct cell overrides. These controls are disabled for complex tables and Viewing mode. Word 16 COM confirmed row semantics and the 0/0/0.075/0.075-inch default cell margins.
• Ribbon: collapse (button, double-click a tab, or Ctrl+F1) with click-to-peek, and tab KeyTips after Alt or F10 (H, N, P, S, R, W, T; F opens File); choosing a tab shows a tip on each of its commands (Alt, H, 1 is Bold), and Escape steps out.
• Shortcuts: Ctrl+L, E, R, J (alignment), Ctrl+Shift+. and , (grow and shrink font), Ctrl+= and Ctrl+Shift+= (sub and superscript) and Ctrl+Space (clear formatting), listed in the help dialog.

Ribbon layout: every panel is one fixed height (104 px, as Word's is), group captions are pinned to the bottom and rows sit at the top, Clipboard has Paste with labelled Cut, Copy and Format Painter beside it, and the Styles gallery shows the built-in names capitalised ("Heading 1"). Font Color and Shading open Word's colour picker (Theme Colors as ten columns over five variants, Standard Colors, and More Colors through the browser's colour dialog; Shading adds No Color) using the Office theme palette, not the document's theme. Margins, Size, Orientation, Vertical alignment and Columns open galleries of page thumbnails with detail lines (inches for margins and paper); the native select stays underneath, so the keyboard and assistive technology still work. Icons carry Word's accent hues and a pressed control is darker than a hovered one. Styles live in styles/ribbon*.css, loaded in order.

View > Zoom opens Word's Zoom dialog (200%, 100%, 75%, page width, whole page or a percentage, with a preview); Many pages, Text width and Wrap to window are not offered. Large icons are fitted to a common frame (measured from each drawing) so they fill their slot evenly.

Layout > Hyphenation is None or Automatic (w:autoHyphenation, undoable): the editing surface asks the browser to hyphenate by the text's language, while Print Layout's line breaker does not hyphenate yet, so it lays lines out as if it were off. View > Multiple pages fits two Print Layout pages side by side (any other zoom returns to one column, and the Zoom dialog offers it as Two pages); zoom now also applies to Print Layout, which ignored it before.

Known limits of what is implemented:

• When a tab is wider than the window, its rightmost groups fold into one dropdown button each (the group's live controls appear in a panel under it; a command closes the panel, Escape too), and unfold when the window widens. Folding goes strictly right to left, with no priority order or intermediate sizes as in Word (a group does not first shrink its buttons), and the panel only scrolls when even folded groups do not fit.

• The Styles gallery shows about three tiles (Word shows more). Compact multilevel-list and paragraph controls keep the full command row inside its group, so Show/Hide ¶ cannot overlap the Styles gallery. In French and German the Editing group folds at 1280 px.

• Icons are one line-icon set with a tinted stroke; Word's are two-tone and drawn per command.

• Inserting headers, footers and page numbers and editing header/footer text share the body undo history. Ctrl+Z/Ctrl+Y, ribbon history and Quick Access history restore both content and previews. Browser contracts cover header insertion, typing and body history across all six bindings. The selection's section supplies the preview and receives inserted parts; edits to a part linked by several sections update all its uses. Word COM confirmed that a page number inserted in section 2 exports as one field in that section and no fields in section 1. Header and Footer menus insert blank default, first-page or even-page parts. First-page insertion enables Different first page in that section; even-page insertion enables the document-wide odd/even setting, in the same undo step. Page Number follows the first/even/default slot being edited, or the default slot from the body. Word COM confirmed a three-page export enables both settings, with PAGE/NUMPAGES in the first-page footer, PAGE in the even-page footer and no fields in the default footer. Decorative header/footer galleries remain missing. Insert > Link to Previous toggles the active first/even/default header/footer story (disabled in section 1, outside a story and in Viewing mode). Inherited content now appears and edits in the continuous preview. Unlinking creates an independent copy, preserving the source XML and relationships; linking removes the local reference and uses the previous section's story. Both are undoable. Word COM confirmed independent section-2 header text with LinkToPrevious false, and matching inherited text with LinkToPrevious true after relinking. A contextual Header & Footer tab appears and opens while editing a story, with Go to Header/Footer, Previous/Next Section, Link to Previous, the first/odd/even settings and Close Header and Footer. Navigation keeps the story variant and updates the body section selection. Empty stories can be visited without changing the model; their parts are created only on typing, with undo removing that first edit and its part. Closing removes the empty preview and returns focus to the body; switching to Viewing mode also closes an active story editor. Header/footer formatting controls now reflect the active story rather than the body selection. Browser contracts cover context, navigation, first typing, undo and close across all six bindings. Word COM confirmed that typing into section 2's previously empty footer creates independent text there and leaves section 1's footer blank. Position controls edit Header from Top and Footer from Bottom in inches for the active section, preserving other measurements exactly, validating the same 0–22-inch range as Page Setup and supporting undo/redo. Word COM confirmed a two-section export keeps section 1 at 0.5/0.5 inches while section 2 uses 0.75/0.875 inches. Review the distances in Print Layout; the continuous story preview stays outside the body editing surface.

• Page Number offers page-thumbnail choices for plain numbers or "Page X of Y", at the left, center or right of the default header or footer. These are PAGE and NUMPAGES fields: Print Layout and Word update both (Word COM confirmed a two-page export reads "Page 1 of 2"). Switching the generated pattern is undoable and preserves surrounding paragraphs. Imported custom page-number text and complex codes are kept; adding a total extends that paragraph, while Plain changes only its alignment. Word's decorative gallery styles remain missing; slot selection is through editing the corresponding first/even/default header or footer, rather than a separate page-number gallery.

• The Borders menu presets use Word's default 0.5 pt automatic pen. The Borders and Shading dialog (paragraphs) sets sides, one style (single, double, dotted, dashed), width and colour for all chosen sides, and a solid fill; there is no per-side pen, Box/Shadow/3-D setting, patterns, page borders, and no preview (Apply to Cell/Table is described under Layout above).

• The Font dialog now has Font and Advanced tabs. Advanced sets horizontal scale, expanded or condensed character spacing, raised/lowered position and a kerning threshold. It preserves untouched mixed values, validates edited values, and applies all dialog changes as one undo step. Combined Font/Advanced changes are atomic; header/footer formatting uses the body history so an undo reverses formatting without also undoing prior header typing. Superscript/Subscript toggles reflect inherited formatting and write <w:vertAlign w:val="baseline"/> when turning it off, including at a collapsed caret. Clearing script in the Font dialog handles inherited and mixed selections with one undo step; baseline renders at full size in both views. Word COM confirmed an exported reset is 12 pt with both script flags off while Normal retains its superscript setting. The source style XML remains unchanged. Tabs support arrow keys, Home/End and all five display locales. Ligatures now offers all 16 Office 2010 combinations, preserves inherited and untouched mixed settings, and writes explicit None overrides. Editing surfaces, story previews, the dialog preview and Print Layout apply the selected OpenType features when the font supports them. Print Layout measures explicit selections with browser text shaping; exact Word glyph metrics remain approximate. Word COM confirmed Standard + Contextual as 3 and the exported None reset as 0. Text effects remain missing. The core now models horizontal scale (0–600%), kerning threshold and signed baseline position, including inherited style values and explicit neutral overrides. These survive editor typing, undo/redo and export in all six bindings. Invalid/unmodeled properties remain protected; Word COM verified an edited 125% / 12 pt kerning / lowered 3 pt run and a neutral reset. Print Layout now applies scale, additional character spacing, baseline position and kerning thresholds, including inherited settings. Scaled widths also drive wrapping and decimal tabs; Word COM confirmed that character spacing is added after scaling. Browser font metrics remain approximate. The continuous editor and header/footer/note previews now render inherited and direct spacing, baseline position and kerning thresholds, with script sizing retained. Paragraphs without an explicit pStyle now resolve the default Normal font settings, checked against Word COM. Horizontal scale now also renders on the continuous surface and in header/footer/note previews, with scaled glyph advances, spacing added after scale, word wrapping and native caret/selection. Unicode grapheme clusters stay intact. On the continuous surface, words split across formatting runs now keep their logical word boundaries when wrapping, with no extra document characters. Browser regressions verify narrow columns, caret placement and undo in all six bindings. Scaled word boxes also suppress browser automatic hyphenation inside those words; Print Layout remains the required reference for pagination and keeps its existing hyphenation limitation. The dialog directs users to Print Layout to review these settings. Word COM verified a UI-exported run with 125% scale, 2 pt expanded spacing, lowered 3 pt position and 12 pt kerning.

The Home > Multilevel List menu now includes Define New Multilevel List. It edits nine levels, with number style, %1–%9 format tokens, start value, restart rule, legal numbering, alignment, number/text positions and tab/space/nothing suffix. It starts from the selected list's supported properties and creates a new independent definition; imported definitions remain untouched. The dialog has a live marker preview, validation, Cancel/Escape, editing-permission checks and all five display locales. Applying the list is one undoable paragraph edit; unused definitions may remain in the additive catalog after undo. All six bindings verify apply/undo/redo/export and preservation of the imported abstract definition. Live editing markers also recalculate on list commands and history changes, including in header/footer/note editors. Word COM verified the exported markers, start 4, never restart, right alignment, 0.25-inch number position, 1-inch text position and space suffix. The dialog fits a 1280×720 viewport with its action buttons visible. For left-to-right paragraphs, the editor and Print Layout now place left, center and right markers around the defined number position, with tab/space/nothing separators and continuation lines at the text indent. Print Layout keeps a marker such as "Part 12." indivisible and does not repeat it on a continuation page. Editor markers are generated CSS, so they never become editable characters. Browser contracts compare editor and Print Layout positions and verify typing at the paragraph start in all six bindings. The editor refreshes its marker font measurements when web fonts load. Right-to-left marker placement and precise editor positioning at center/right/decimal custom tabs remain approximate; The dialog's Number font group sets a level's marker font family, size, bold, italic and colour (w:lvl/w:rPr, written in schema order for new definitions, parsed from imports, and applied to the editor and Print Layout markers over the paragraph's text formatting). Other rPr properties (underline, effects, theme colours, East Asian fonts) and style-inherited marker fonts are not modeled or editable.

Imported heading outlines now resolve w:lvl/w:pStyle associations, rather than treating every style-inherited item as level one. Direct paragraph numbering and explicit numId=0 removal retain precedence; effective level overrides are respected. Text editing preserves the original styles and numbering XML. All six browser bindings verify nested markers, editing and opening Define New Multilevel List at the inherited level with its imported pattern. Additive definition export writes style links in schema order. Word COM confirmed the five-item sequence 1., 1.1., 1.2., 2., 2.1. when styles also specify matching ilvl. Installed Word discards the second heading's numbering when that redundant style level is omitted; the viewer follows the OOXML association rule for those imports. Each level has a Link level to style select (a style belongs to one level). Applying the list writes w:numPr into those existing paragraph styles in styles.xml (schema-ordered, the rest of the style XML untouched) and a w:pStyle on the new level; any other style-catalog edit is still refused on save. The style link is not part of editor history: Undo removes the list from the selection, but styles stay linked to the (retained) definition. Creating new styles from the dialog is not supported.

Still not at parity:

• Home: Text Effects; Multilevel List offers five styles (1. 1.1. 1.1.1., 1. a) i., and heading-linked 1 / 1.1, Article I. / Section 1.1 and I. / A. outlines that link the document's existing Heading styles), not Word's full gallery (no bullet outlines or previews; "Section 1.01" shows as 1.1). Define New Multilevel List still needs Word's graphical number placeholders and its apply-to/list-style options. (Add tab stop at: a level's w:tab w:val="num" is read, written and honoured by the marker's tab suffix in the editor and Print Layout.) Text Highlight keeps the 17-colour list (Word's is a short list too). Line Spacing offers presets; the Paragraph dialog has the rest.
• Insert: Cover Page galleries (one plain design exists), Shapes, Icons, 3D Models, inserting or editing SmartArt (existing SmartArt is shown read-only from its saved drawing, not recomputed), Charts, Screenshot, floating or formatted Text Boxes, WordArt, Equation, Signature Line, Object.
• Layout and References: Manual Hyphenation and its options, Position and Wrap Text, Citations, Bibliography, Index and Table of Authorities, and automatic updating of REF, PAGEREF and SEQ results (Update Fields refreshes them on request; inserting a caption also renumbers the label's captions and refreshes REF results that quote a caption, in the same undo step; PAGEREF, table of contents and other results change only through Update Fields).
• Review and View: Editor pane, Thesaurus, Translate, Accessibility, Compare, Protect, Ink; Read Mode, Web and Outline views, New Window, Split and Macros.
• Dropdown galleries: Margins, Size, Orientation, Vertical alignment, Columns, Page Number, Borders and Line spacing are galleries with thumbnails (Line spacing ends with Line Spacing Options, which opens the Paragraph dialog; Borders ends with Borders and Shading). Page number format, Sort, Change case and similar stay plain text lists, as Word's Change Case does. Zoom is a percentage list next to a Zoom dialog. Margins ends with Custom Margins, which opens Page Setup. Columns includes Left and Right presets and ends with More Columns. Individual widths and gaps are editable; changing a width adjusts the adjacent column to retain the available text width. Print Layout uses unequal widths and reflows paragraph continuations. The continuous editing surface shows unequal-column sections at full text width, so Print Layout is required to review their columns.
• Ribbon: command KeyTips use Word's keys for the commands that share a name with Word's (Bold 1, Paste V, Font Color FC and so on) and two letters from the label for the rest, so a few differ from Word's; there are no group-level tips and they are not localised. Customisation is limited to showing and hiding commands (File > Customize Ribbon; no reordering, custom tabs or groups, and nothing is stored between sessions unless the host saves the ids from the ribbon-customize event), no table-design or layout tools beyond row and column commands.

Fidelity

• Print Layout recalculates PAGE, NUMPAGES, SECTIONPAGES, DATE and TIME (with \@ pictures); TOC, cross-references and other fields show Word's saved result. Field results are editable; the begin/code/separate/end structure is preserved and guarded against partial deletion.
• Picture crop and effects. Print Layout draws inline pictures on their lines and floating pictures at their wp:positionH/wp:positionV positions, in front of or behind text. Body text wraps around square, tight and through pictures on their larger side (using the picture's rectangle, not its outline) and below top-and-bottom pictures; character/line frames approximate to the column/paragraph, and wrap distances use Word's defaults. Pictures in table cells paginate inline; header and footer pictures (inline and floating) are drawn on every page; floats inside table cells are not positioned. The editing surface still approximates floats with CSS floats.
• Picture bullets and numStyleLink. Multilevel counters now respect lvlRestart=0 (never), one-based higher-level restart triggers, the omitted previous-level default, skipped ancestor levels and per-instance level/start overrides. Nested items initialize omitted ancestors, so a subsequent explicit ancestor advances its counter. Word COM comparisons cover default, never and restart-after-Level-1 sequences, including a skipped level whose intermediate ancestor never restarts; all six browser bindings display the same markers. Text editing and export preserve the original numbering XML. Out-of-range triggers use the OOXML default; Word's import normalization of redundant/invalid explicit triggers is not replicated (this installed Word discarded a level with an explicit previous-level trigger, rather than treating it like an omitted trigger). Remaining Define New Multilevel List controls are listed above.
• Prior-formatting snapshots for rPrChange/pPrChange, and table-structure revisions. Tracked moves are linked by name (accepting or rejecting either side resolves both) and saved with their range markers. Under Track Changes, dragging text or cutting and pasting the same text records a move; moving formatted content across table cells is recorded as a deletion and an insertion. Comments may span paragraphs (one range per comment); range edges outside any run move to the nearest commented text when edited.
• Print Layout measures and draws text with formatting inherited from document defaults, paragraph and character styles and theme fonts. It uses metric-compatible substitutes (Carlito, Caladea, Arimo, Tinos, Cousine) when Word's fonts are missing, and re-paginates once web fonts load. Single line height comes from the font's ascent and descent. Kerning, per-script fonts (East Asian and complex-script faces) and comparisons against Word-rendered references are still missing.
• Print Layout places footnotes at the bottom of the page where their reference lands (reserving the space, under Word's separator rule) and endnotes after the last paragraph; note references and marks print as superscript numbers. Footnotes that do not fit are not continued onto the next page, and multi-column pages put notes below the whole page, not under each column.
• New documents carry Word's modern defaults (Calibri 11pt, 8pt after, 1.08 lines; Normal, Heading 1–3, Title, TOC 1–3 and Hyperlink styles) and save them in styles.xml, so they open in Word as edited. The editing surface and Print Layout apply the same spacing and line heights.
• Print Layout tables use the document's grid widths, cell margins, borders (table style, table and cell), shading, vertical alignment and table indent or alignment. Vertically merged cells are drawn as one cell, but their text stays in the merge's first row.

Engineering follow-ups

• Modules over the 300-line guideline (non-test, non-data): web-component/src/ribbon-tabs.ts (~490, the tab definitions), ribbon-home.ts, backstage-pages.ts, model-adapter.ts and a few files just over 300; the locale tables and generated schema types are data.
• ssr.test.ts can time out (5 s) when the whole suite runs under load; it passes alone.