Existing direct PPT character runs

parsePpt(bytes).slides[index].texts[index].runs returns immutable PptCharacterRun handles with UTF-16 start, end, text and optional directFontSizePoints. The implicit terminating paragraph mark is excluded from the exposed span and preserved in the underlying style record. A missing size means unresolved inheritance, not a default appearance.

const document = parsePpt(bytes);
const text = document.slides[0].shapes.find(shape => shape.name === 'FixtureTitle')!.texts[0];
if (text.runsStatus === 'decoded') text.runs[0].directFontSizePoints = 32;
const saved = document.serialize();

runsStatus is decoded, absent or unsupported; runsDiagnostic explains unsupported formatting while valid slide text remains readable. Earlier versions threw on PptText.runs. Consumers can now inspect these statuses and use the readonly run list. The original three-argument PptText constructor remains compatible, but a caller-created text atom has no document formatting owner. Notes rich runs remain undecoded.

The setter changes only an existing two-byte font-size operand in an eligible known inline text box. Values must be primitive integers from 1 to 4000 points. Unknown styles, missing slots, terminal-mark-only runs, shared persist ownership, save-history aliases, OOXML mirrors and unsupported shape contexts refuse atomically. Outline text may have readable direct runs but remains unwritable. No style record is inserted, split or cleared; effective inherited styling, masters and other character properties are unresolved. Handles validate their physical run identity and refresh through supported text/font changes.

The tracked prepare-native-ppt-font-runs.mjs driver reproduces the owned native title and Unicode-title edits. Generation alone does not execute PowerPoint. Native PowerPoint 16 comparisons cover all selected character sizes, other captured fonts/styles/text, slide geometry, notes and counts. Save/reopen is compared against an unchanged native-save control because both regenerate the same six notes-shape IDs. These checks do not establish rendering or complete rich-text fidelity.