Gap 19: ODT ruby read and written

Ruby (`text:ruby`, ODF 1.3 §6.4: a base text with ruby text over it,
furigana or pinyin) was read as its base and ruby text run together,
and the writer wrote any ruby as plain text (its comment wrongly said
ODF has none).

Ruby is now read as WordCraft's Phonetic Guide. It is written back as
ODF ruby, above its base and centred, with an automatic ruby style.
A ruby inside a tracked change is still written as its base text,
which the change marks, so the tracking isn't lost. LibreOffice shows
the round-tripped ruby over its base, and the content validates.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GBVQLyDnrG8Tn1yDQcUabC

crates/formats/src/odt/body.rs

@@ -30,6 +30,9 @@ pub(super) struct Body<'a> {
     pub(super) entries: &'a [String],
     /// The paragraph before had a page break after it: the next one starts a page.
     break_next: bool,
+    /// A ruby being read: its base text, ruby text, which of them the text goes to (`true`:
+    /// the ruby), and the base's formatting.
+    ruby: Option<(String, String, Option<bool>, Fmt)>,
     /// The form controls of `office:forms`, placed where a `draw:control` names them.
     forms: super::forms::FormsReader,
     pub(super) manifest: Option<&'a HashMap<String, String>>,
@@ -128,6 +131,7 @@ impl<'a> Body<'a> {
             entries: &[],
             forms: Default::default(),
             break_next: false,
+            ruby: None,
             manifest: None,
             containers: vec![Vec::new()],
             fmt: Vec::new(),
@@ -216,6 +220,38 @@ impl<'a> Body<'a> {
             Ev::End(q) if self.forms.end(&q) => {}
             Ev::Start(q, a) if q == "draw:control" => self.place_control(&a),
             Ev::End(q) if q == "draw:control" => {}
+            // Ruby (ODF 1.3 §6.4): its base and ruby text, read on their own.
+            Ev::Start(q, _) if q == "text:ruby" && self.para.is_some() && self.field.is_none() => {
+                self.ruby = Some((String::new(), String::new(), None, self.cur_fmt()));
+            }
+            Ev::Start(q, _) if self.ruby.is_some() && matches!(q.as_str(), "text:ruby-base" | "text:ruby-text") => {
+                if let Some(r) = &mut self.ruby {
+                    r.2 = Some(q == "text:ruby-text");
+                }
+            }
+            Ev::End(q) if self.ruby.is_some() && matches!(q.as_str(), "text:ruby-base" | "text:ruby-text") => {
+                if let Some(r) = &mut self.ruby {
+                    r.2 = None;
+                }
+            }
+            Ev::End(q) if q == "text:ruby" && self.ruby.is_some() => {
+                if let Some((base, ruby, _, fmt)) = self.ruby.take() {
+                    let (base, ruby) = (base.trim().to_string(), ruby.trim().to_string());
+                    match (base.is_empty(), ruby.is_empty()) {
+                        (false, false) => self.push_inline(Inline::Ruby { base, ruby, fmt }),
+                        // A guide over nothing, or reading nothing: its text.
+                        (false, true) | (true, false) => self.push_inline(Inline::Text(if base.is_empty() { ruby } else { base }, fmt)),
+                        (true, true) => {}
+                    }
+                }
+            }
+            Ev::Text(t) if self.ruby.is_some() => {
+                if let Some((base, ruby, Some(in_ruby), _)) = &mut self.ruby {
+                    let s = if *in_ruby { ruby } else { base };
+                    let room = MAX_FIELD_RESULT.saturating_sub(s.len());
+                    s.extend(t.chars().take(room));
+                }
+            }
             Ev::Start(q, a) => {
                 if self.depth < MAX_XML_DEPTH {
                     self.start(&q, &a);

crates/formats/src/odt/tests.rs

@@ -848,8 +848,8 @@ fn tracked_changes_round_trip_through_export() {
 
 #[test]
 fn an_inserted_ruby_keeps_its_tracked_insertion() {
-    // ODF has no ruby: its base text is written as text, and the insertion on the ruby must
-    // still be a change range around that text, not plain untracked text.
+    // A ruby inside a tracked insertion is written as its base text, so that it stays inside
+    // the change range rather than becoming plain untracked text.
     use wordcraft_doc::RevisionKind::Insert;
     let props = wordcraft_doc::props::CharProps::default();
     let mut p = wordcraft_doc::Paragraph::with_text("before ", props.clone());

crates/formats/src/odt/tests_more.rs

@@ -29,6 +29,7 @@ mod para_borders;
 mod polygons;
 mod rotation;
 mod rtl;
+mod ruby;
 mod settings;
 mod shapes;
 mod spacing;

crates/formats/src/odt/tests_more/ruby.rs

@@ -0,0 +1,46 @@
+//! Ruby (ODF 1.3 §6.4 `text:ruby`: a base text with ruby text over it, furigana or pinyin) read as
+//! WordCraft's Phonetic Guide and written back as ODF ruby.
+
+use crate::odt::tests::{NS_T, content_of, package};
+use crate::odt::{export, import};
+use wordcraft_doc::para::InlineObject;
+
+fn open(p: &str) -> wordcraft_doc::Document {
+    let content = format!(
+        r#"<office:document-content {NS_T}><office:automatic-styles><style:style style:name="Ru1" style:family="ruby"><style:ruby-properties style:ruby-position="above" style:ruby-align="center"/></style:style></office:automatic-styles><office:body><office:text>{p}</office:text></office:body></office:document-content>"#
+    );
+    import(&package(&content, None)).unwrap()
+}
+
+/// Each ruby: (base, ruby text), and the paragraph's text.
+fn rubies(d: &wordcraft_doc::Document) -> (Vec<(String, String)>, String) {
+    let p = d.body.iter().find_map(|b| b.as_para()).unwrap();
+    let r = p
+        .objects
+        .iter()
+        .filter_map(|o| if let InlineObject::Ruby { base, ruby, .. } = o { Some((base.clone(), ruby.clone())) } else { None })
+        .collect();
+    (r, p.text.replace(wordcraft_doc::para::OBJ, "[R]"))
+}
+
+#[test]
+fn ruby_is_read_as_a_phonetic_guide_and_written_back() {
+    let d = open(
+        r#"<text:p>Ruby: <text:ruby text:style-name="Ru1"><text:ruby-base>漢字</text:ruby-base><text:ruby-text>かんじ</text:ruby-text></text:ruby> after.</text:p>"#,
+    );
+    assert_eq!(rubies(&d), (vec![("漢字".to_string(), "かんじ".to_string())], "Ruby: [R] after.".to_string()));
+    let c = content_of(&export(&d).unwrap());
+    assert!(c.contains("<text:ruby-base>漢字</text:ruby-base><text:ruby-text>かんじ</text:ruby-text></text:ruby>"), "{c}");
+    assert!(c.contains(r#"style:family="ruby"><style:ruby-properties style:ruby-position="above""#), "{c}");
+    assert_eq!(rubies(&import(&export(&d).unwrap()).unwrap()).0, vec![("漢字".to_string(), "かんじ".to_string())]);
+}
+
+#[test]
+fn ruby_without_a_reading_or_a_base_is_its_text() {
+    let d = open(r#"<text:p><text:ruby><text:ruby-base>漢字</text:ruby-base><text:ruby-text/></text:ruby>!</text:p>"#);
+    assert_eq!(rubies(&d), (Vec::new(), "漢字!".to_string()));
+    let d = open(
+        r#"<text:p><text:ruby><text:ruby-base><text:span>基</text:span>本</text:ruby-base><text:ruby-text>きほん</text:ruby-text></text:ruby></text:p>"#,
+    );
+    assert_eq!(rubies(&d).0, vec![("基本".to_string(), "きほん".to_string())]);
+}

crates/formats/src/odt/writer.rs

@@ -159,6 +159,8 @@ pub(super) struct Writer {
     /// kept objects' folders with their media types, for the manifest.
     pub(super) object_names: usize,
     pub(super) object_dirs: Vec<(String, String)>,
+    /// Ruby was written: its automatic ruby style is.
+    ruby_used: bool,
     /// Form controls written (`form:*` elements for `office:forms`), and whether this writer's
     /// text may hold them (the body's; not headers and footers).
     pub(super) forms: Vec<String>,
@@ -294,8 +296,6 @@ impl Writer {
 
     fn plain_inlines(&mut self, inl: &[Inline], out: &mut String) {
         let mut prev_space = true;
-        // ODF has no ruby: its base text goes through the text path below.
-        let inl = model::ruby_as_text(inl);
         let last = inl.len().saturating_sub(1);
         for (idx, i) in inl.iter().enumerate() {
             match i {
@@ -420,8 +420,25 @@ impl Writer {
                         prev_space = result.ends_with(' ');
                     }
                 },
-                // Read as its base text by `ruby_as_text` above.
-                Inline::Ruby { .. } => {}
+                // Inside a tracked change: its base text, which the text path marks as changed.
+                Inline::Ruby { base, fmt, .. } if fmt.ins.is_some() || fmt.del.is_some() => {
+                    self.plain_inlines(&[Inline::Text(base.clone(), fmt.clone())], out);
+                    prev_space = false;
+                }
+                // Ruby (§6.4): the base text in its formatting, the ruby text over it.
+                Inline::Ruby { base, ruby, fmt } => {
+                    self.ruby_used = true;
+                    let base_xml = match self.text_style(&Fmt { link: None, ..fmt.clone() }) {
+                        Some(n) => format!("<text:span text:style-name=\"{n}\">{}</text:span>", x(base)),
+                        None => x(base),
+                    };
+                    out.push_str(&format!(
+                        "<text:ruby text:style-name=\"{}Ru1\"><text:ruby-base>{base_xml}</text:ruby-base><text:ruby-text>{}</text:ruby-text></text:ruby>",
+                        self.prefix,
+                        x(ruby)
+                    ));
+                    prev_space = false;
+                }
                 Inline::Equation { linear, display } => {
                     self.formula(linear, *display, out);
                     prev_space = false;
@@ -748,6 +765,12 @@ impl Writer {
                 ));
             }
         }
+        if self.ruby_used {
+            s.push_str(&format!(
+                "<style:style style:name=\"{}Ru1\" style:family=\"ruby\"><style:ruby-properties style:ruby-position=\"above\" style:ruby-align=\"center\"/></style:style>",
+                self.prefix
+            ));
+        }
         for (i, props) in self.row_styles.iter().enumerate() {
             s.push_str(&format!(
                 "<style:style style:name=\"{}Row{}\" style:family=\"table-row\"><style:table-row-properties{props}/></style:style>",

docs/file-format-parity.md

@@ -1,6 +1,6 @@
 # File-format parity with Microsoft Word
 
-> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-11-01 · **Change:** trivial (ODT page breaks after a paragraph, kept lines, widow control, hyphenation, table alignment and width and row heights); previously trivial (in-line drawings raised or lowered by their run's position; ODT in-line frames keep their place on the baseline; leading's space after the last line; text box borders shown by LibreOffice); previously trivial (ODT form controls opened and saved as content controls); previously trivial (password-protected ODT opened and saved); previously trivial (ODT headers and footers keep their shapes, text boxes, charts and embedded objects on save); previously trivial (ODT embedded spreadsheets and OLE objects kept whole instead of lost; flat ODT sub-documents valid `office:document`s); previously trivial (ODT charts in drawing groups drawn on open); previously trivial (ODT charts opened and saved as editable charts; flat ODT sub-documents no longer end the body); previously trivial (ODT leading read as an at-least spacing); previously trivial (ODT tracked formatting changes; changed regions named by `xml:id`); previously trivial (ODT drop caps; tab stops no longer drop a paragraph's background); previously trivial (flat ODT `.fodt` opened and saved; ODT fidelity re-estimated at ~80%); previously trivial (ODT page settings; a footnote no longer takes a footer's text); previously trivial (ODT dates in their formats, sequences, chapters and references); previously trivial (ODT bookmarks over text); previously trivial (ODT tables of contents and indexes; ODT fidelity re-estimated); previously trivial (ODT polygons, polylines and paths); previously trivial (ODT arrowheads, dashes and gradients); previously trivial (ODT groups of shapes and pictures); previously trivial (ODT rotated and mirrored shapes and pictures); previously trivial (ODT drawing shapes read and written); previously trivial (ODT text box frames keep their line, fill, padding and fit); previously trivial (ODT Asian and complex-script fonts); previously trivial (ODT right-to-left paragraphs); previously trivial (ODT text boxes kept); previously trivial (ODT unnumbered headings detached from the outline); previously trivial (ODT contextual spacing and layout settings); previously trivial (ODT custom character styles kept); previously trivial (ODT list level positions); previously trivial (ODT custom paragraph styles kept); previously trivial (ODT equations written as formula objects); previously trivial (ODT numbered headings written as headings); previously trivial (ODT floating pictures); previously trivial (ODT paragraph borders and background); previously trivial (ODT heading numbering); previously trivial (ODT font-face names); previously trivial (ODT table cell borders and padding); previously trivial (ODT heading, title, quote and preformatted styles keep their look); previously trivial (ODT tab stops read and written); previously trivial (ODT character formatting read and written); previously trivial (ODT lists keep their number formats, bullets and identity); previously trivial (ODT comments read and written); previously trivial (ODT footnotes and endnotes read and written); previously trivial (ODT headers, footers and text fields written; fields read); previously trivial (ODT paragraph spacing, indents and line spacing read and written); previously trivial (a paragraph naming an undefined style is formatted as Normal, as in Word, #5077); previously trivial (a hyperlinked TOC writes its page numbers as `PAGEREF _Toc… \h` fields, as Word does, #5097); previously trivial (HTML import ends the empty comments <!--> and <!---> at once, #5040); previously trivial (chart and SmartArt text the font lacks is drawn in a fallback face, so Chinese labels no longer show boxes, #4720); previously trivial (bibliography sources keep a corporate author (`b:Corporate`): read, written, cited and listed whole, #4848); previously trivial (custom-property bookmark-link preservation, #4767); previously trivial (note conversion preserves content with an ordered reference/run walk, #4750); previously trivial (DOCX comment-ID save lookups); previously trivial (built-in heading styles have their outline level without `w:outlineLvl`, #4696); previously trivial (DOCX comment ranges inside footnotes and endnotes are kept on read, #4548); previously trivial (RTF import and export keep Windows and Enhanced Metafile pictures (`\wmetafile`, `\emfblip`), #4259); previously trivial (#4658 bounds nested Markdown reference-label work); previously trivial (HTML import keeps preformatted lines with CR or CRLF input newlines, #4810); previously trivial (DOCX parts stored under another casing keep their embedded fonts through a save, and a private save of a kept glossary escapes the attribute values it rewrites; previously trivial: the `.doc` reader logs what its copy budget leaves out, once a kind per document; importers bound hostile expansion: font names, links,Line truncated
+> **Last reviewed:** 2026-10-11 · **Last updated:** 2026-11-01 · **Change:** trivial (ODT ruby read and written); previously trivial (ODT page breaks after a paragraph, kept lines, widow control, hyphenation, table alignment and width and row heights); previously trivial (in-line drawings raised or lowered by their run's position; ODT in-line frames keep their place on the baseline; leading's space after the last line; text box borders shown by LibreOffice); previously trivial (ODT form controls opened and saved as content controls); previously trivial (password-protected ODT opened and saved); previously trivial (ODT headers and footers keep their shapes, text boxes, charts and embedded objects on save); previously trivial (ODT embedded spreadsheets and OLE objects kept whole instead of lost; flat ODT sub-documents valid `office:document`s); previously trivial (ODT charts in drawing groups drawn on open); previously trivial (ODT charts opened and saved as editable charts; flat ODT sub-documents no longer end the body); previously trivial (ODT leading read as an at-least spacing); previously trivial (ODT tracked formatting changes; changed regions named by `xml:id`); previously trivial (ODT drop caps; tab stops no longer drop a paragraph's background); previously trivial (flat ODT `.fodt` opened and saved; ODT fidelity re-estimated at ~80%); previously trivial (ODT page settings; a footnote no longer takes a footer's text); previously trivial (ODT dates in their formats, sequences, chapters and references); previously trivial (ODT bookmarks over text); previously trivial (ODT tables of contents and indexes; ODT fidelity re-estimated); previously trivial (ODT polygons, polylines and paths); previously trivial (ODT arrowheads, dashes and gradients); previously trivial (ODT groups of shapes and pictures); previously trivial (ODT rotated and mirrored shapes and pictures); previously trivial (ODT drawing shapes read and written); previously trivial (ODT text box frames keep their line, fill, padding and fit); previously trivial (ODT Asian and complex-script fonts); previously trivial (ODT right-to-left paragraphs); previously trivial (ODT text boxes kept); previously trivial (ODT unnumbered headings detached from the outline); previously trivial (ODT contextual spacing and layout settings); previously trivial (ODT custom character styles kept); previously trivial (ODT list level positions); previously trivial (ODT custom paragraph styles kept); previously trivial (ODT equations written as formula objects); previously trivial (ODT numbered headings written as headings); previously trivial (ODT floating pictures); previously trivial (ODT paragraph borders and background); previously trivial (ODT heading numbering); previously trivial (ODT font-face names); previously trivial (ODT table cell borders and padding); previously trivial (ODT heading, title, quote and preformatted styles keep their look); previously trivial (ODT tab stops read and written); previously trivial (ODT character formatting read and written); previously trivial (ODT lists keep their number formats, bullets and identity); previously trivial (ODT comments read and written); previously trivial (ODT footnotes and endnotes read and written); previously trivial (ODT headers, footers and text fields written; fields read); previously trivial (ODT paragraph spacing, indents and line spacing read and written); previously trivial (a paragraph naming an undefined style is formatted as Normal, as in Word, #5077); previously trivial (a hyperlinked TOC writes its page numbers as `PAGEREF _Toc… \h` fields, as Word does, #5097); previously trivial (HTML import ends the empty comments <!--> and <!---> at once, #5040); previously trivial (chart and SmartArt text the font lacks is drawn in a fallback face, so Chinese labels no longer show boxes, #4720); previously trivial (bibliography sources keep a corporate author (`b:Corporate`): read, written, cited and listed whole, #4848); previously trivial (custom-property bookmark-link preservation, #4767); previously trivial (note conversion preserves content with an ordered reference/run walk, #4750); previously trivial (DOCX comment-ID save lookups); previously trivial (built-in heading styles have their outline level without `w:outlineLvl`, #4696); previously trivial (DOCX comment ranges inside footnotes and endnotes are kept on read, #4548); previously trivial (RTF import and export keep Windows and Enhanced Metafile pictures (`\wmetafile`, `\emfblip`), #4259); previously trivial (#4658 bounds nested Markdown reference-label work); previously trivial (HTML import keeps preformatted lines with CR or CRLF input newlines, #4810); previously trivial (DOCX parts stored under another casing keep their embedded fonts through a save, and a private save of a kept glossary escapes the attribute values it rewrites; previously trivial: the `.doc` reader logs what its copy budget leaves out, once a kind per document; imporLine truncated
 
 Every format Word opens or saves, what WordCraft does with it, and how it's tested. Fidelity is the
 share of a typical real-world file's content and formatting that survives (read: shows correctly;
@@ -57,7 +57,7 @@ Weights are the share of a Word user's file traffic (estimate). Read/write: ✅
 | PDF export | 8% | W | — | ✅ | ~80% | 6–10 | `crates/pdf/src/tests.rs` | krilla: embedded subsets, selectable text incl. field results (#133); Hebrew and Arabic copy and search as whole words (right-to-left glyphs written in visual order, #1383, also with fonts that draw lam-alef as two glyphs at one x, #2310); All Caps and Small Caps text extracts as the capitals shown, as from Word's PDFs, and never changes the case of other text (#1473), links, outline, tagging. Outline destinations follow leading page breaks to the heading text. Fonts it can't subset become outlines (#132). Print Markup (#589): comments in balloons beside each page (scaled to its paper) and tracked changes; HTML/Markdown/text copies end with a comment list. Horizontal and vertical lines inside groups are drawn (#1474). No PDF/A option, no "best for printing/online" choice |
 | PDF open (PDF Reflow, Word for Windows) | 1% | R | ❌ | — | 0% | 30–50 | — | Converting a PDF into an editable document. A sibling app (PdfCraft) may supply the parser |
 | `.rtf` Rich Text Format | 3% | R/W | 🟡 | 🟡 | ~50% | 10–15 | `crates/formats/src/tests.rs` | ~1,500 lines: text, character/paragraph formatting, styles, lists, tables, pictures (`\shppict`, #154; Windows and Enhanced Metafiles, `\wmetafile` and `\emfblip`, read and written, #4259), fields, bookmarks. 8-bit text in the document's code page (`\ansicpg`) or the current font's (`\fcharset`, `\cpg`): Cyrillic, Central European, Greek, Turkish, Hebrew, Arabic, Baltic, Vietnamese, Thai (was Windows-1252 only), Mac OS Roman (`\mac`, `\fcharset77`) and DOS code pages (`\pc` 437, `\pca` 850, `\cpg` 437/737/850/852/857/866, `\fcharset254`) (#1653). East Asian multibyte code pages decoded as runs: 932 Shift-JIS (`\fcharset128`, Japanese), 936 GBK (134, Simplified Chinese), 949 UHC/windows-949 (129, Korean) and 950 Big5 (136, Traditional Chinese) through `\ansicpg`, `\cpg` or the font's charset, escaped or raw, a lead byte and its trail byte together; invalid sequences read as U+FFFD, and a run that starts `EF BB BF` is text, not a BOM (#1653). Pasted from the system clipboard where the platform offers it (Windows, Wayland) when there is no HTML (#687). Tracked insertions and deletions read and written (`\revtbl`, `\revised`/`\deleted`, authors, `\revdttm` dates), so Accept/Reject All work after opening or a round trip; tracked paragraph marks (`\par` inside `\revised`/`\deleted` groups, including a `\sect` inside a deletion) and character and paragraph formatting revisions (`\crauth`/`\crdate` with `\oldcprops`, `\prauth`/`\prdate` with `\oldpprops`) read and written; section and table formatting revisions (`\oldsprops`, `\oldtprops`) not yet. Sections on import (#1378): each `\sect` ends a section with its own page size and orientation, margins, header/footer distance, columns, break type, page-number restart, start and format, title page and headers/footers (those it leaves out link to the previous); export writes every section too (break type, page size and orientation, margins, header/footer distance, columns, page numbering, title page; not headers/footers). Thin: comments, notes, RTL |
-| `.odt` OpenDocument Text (and flat `.fodt`) | 2% | R/W | 🟡 | 🟡 | ~82% | 30–50 | `crates/formats/src/tests.rs`, `crates/formats/src/odt/tests.rs` and one file per feature in `crates/formats/src/odt/tests_more/`, `crates/engine/tests/it/odt_sections.rs`, `odt_toc.rs`, `odt_fields.rs`, `odt_charts.rs`, `odt_objects.rs`, `odt_password.rs`, `odt_forms.rs`; checked against LibreOffice's own documents (round trips compared page by page) and the ODF 1.3 schema | How text flows: a page break after a paragraph (`fo:break-after`, a page break before the next paragraph as Word has it), lines kept together (`fo:keep-together`), widow and orphan control (`fo:widows`/`fo:orphans`: on with any line count, off with none; the counts themselves aren't kept) and hyphenation (`fo:hyphenate`, a paragraph's in ODF and the document's in WordCraft: a document with a hyphenated paragraph hyphenates, its other paragraphs opting out) are read and written; a table's alignment and width (`table:align`, `style:rel-width`, or `style:width` for an aligned table) and its rows' heights (`style:row-height` exact, `style:min-row-height` at least) are read and written. Form controls (`office:forms` controls placed by `draw:control`, ODF 1.3 §13) open as content controls — text fields and text areas as plain text controls, check boxes as check boxes, radio buttons as check boxes with round symbols, list boxes as drop-down lists, combo boxes as combo boxes, date fields as date controls, each with its value, entries and selection, its name as the control's tag and a label as its title — and content controls of those kinds in the body are written back as form controls LibreOffice shows with their values (in headers and footers, as their text); buttons, images, hidden and other controls aren't read, and a control's size and look aren't kept. Password-protected ODT (ODF 1.3 Part 2 §3.4) opens with its password — AES-256-CBC with a SHA-256 or SHA-1 start key and PBKDF2, as LibreOffice writes it; the old Blowfish encryption is refused with a message saying so — and a document opened with a password, or saved with one (Save with password), is written encrypted the way LibreOffice encrypts (every file but the `mimetype` and manifest; each with its own salt and initialisation vector; SHA-256 checksums), which LibreOffice opens with the password. Flat OpenDocument text (`.fodt`: the whole document in one `office:document`, pictures inline as base64 `office:binary-data`, formulas inline) is opened and saved as a package is, both validating against the schema. Tables of contents and other indexes (`text:table-of-content`, `text:illustration-index`/`text:table-index`, `text:alphabetical-index`, `text:bibliography`) open as Word's `TOC` (levels from the source's `text:outline-level`; `\c` with the caption name for a table of figures), `INDEX` and `BIBLIOGRAPHY` fields — in the title paragraph when the index has one, as WordCraft inserts a table, else around the entries — so References › Update Table regenerates them; LibreOffice's Contents 1–10, Contents Heading and Figure Index 1 styles are WordCraft's TOC 1–9, TOC Heading and Table of Figures; WordCraft's tables are written back as ODF indexes with their source and entry templates (LibreOffice updates them), entries' links in the Index Link style; user and object indexes are read as their paragraphs; index marks (`text:alphabetical-index-mark`, Word's `XE`) are not read. Custom character styles (a common text style other than LibreOffice's link, note-mark and list-label styles kept as a character style with its name, parent and own formatting, its text in it; written back as common text styles), custom paragraph styles (a common style other than Standard, the kinds' and the note texts' kept as a document style with its name, parent and own formatting, its paragraphs in it rather than given its formatting directly; written back as common styles, named so LibreOffice keeps them), paragraph borders (each side's line and padding) and background, heading numbering (`text:outline-style`: each level's format, prefix, suffix, levels shown and start number the headings through their styles, as Word's numbered headings, and are written back), styles (the file's own Heading 1–6, Title, Quotations and Preformatted Text definitions give those styles' look on open — font, size, percent sizes included, bold, colour, spacing, alignment, keep with next — and saving writes the document's own style definitions rather than fixed ones), tab stops (left, centre, right, decimal; dot, hyphen, underline and middle-dot leaders; LibreOffice's indent-relative positions converted, and a `settings.xml` written saying positions run from the margin) and the default tab interval, character formatting (underline styles and colour, double strike, caps, small caps, hidden text kept hidden, letter spacing, scale, raised and lowered text, outline, shadow, emboss, engrave, language, Asian and complex-script foLine truncated
+| `.odt` OpenDocument Text (and flat `.fodt`) | 2% | R/W | 🟡 | 🟡 | ~82% | 30–50 | `crates/formats/src/tests.rs`, `crates/formats/src/odt/tests.rs` and one file per feature in `crates/formats/src/odt/tests_more/`, `crates/engine/tests/it/odt_sections.rs`, `odt_toc.rs`, `odt_fields.rs`, `odt_charts.rs`, `odt_objects.rs`, `odt_password.rs`, `odt_forms.rs`; checked against LibreOffice's own documents (round trips compared page by page) and the ODF 1.3 schema | Ruby (`text:ruby`, §6.4: a base text with ruby text over it) is read as WordCraft's Phonetic Guide and written back as ODF ruby above its base, centred (one inside a tracked change is written as its base text, which the change marks); its own position and alignment aren't kept. Emphasis marks (`style:text-emphasize`), character borders (LibreOffice's `loext:border`) and rotated text (`style:text-rotation-angle`) aren't read. How text flows: a page break after a paragraph (`fo:break-after`, a page break before the next paragraph as Word has it), lines kept together (`fo:keep-together`), widow and orphan control (`fo:widows`/`fo:orphans`: on with any line count, off with none; the counts themselves aren't kept) and hyphenation (`fo:hyphenate`, a paragraph's in ODF and the document's in WordCraft: a document with a hyphenated paragraph hyphenates, its other paragraphs opting out) are read and written; a table's alignment and width (`table:align`, `style:rel-width`, or `style:width` for an aligned table) and its rows' heights (`style:row-height` exact, `style:min-row-height` at least) are read and written. Form controls (`office:forms` controls placed by `draw:control`, ODF 1.3 §13) open as content controls — text fields and text areas as plain text controls, check boxes as check boxes, radio buttons as check boxes with round symbols, list boxes as drop-down lists, combo boxes as combo boxes, date fields as date controls, each with its value, entries and selection, its name as the control's tag and a label as its title — and content controls of those kinds in the body are written back as form controls LibreOffice shows with their values (in headers and footers, as their text); buttons, images, hidden and other controls aren't read, and a control's size and look aren't kept. Password-protected ODT (ODF 1.3 Part 2 §3.4) opens with its password — AES-256-CBC with a SHA-256 or SHA-1 start key and PBKDF2, as LibreOffice writes it; the old Blowfish encryption is refused with a message saying so — and a document opened with a password, or saved with one (Save with password), is written encrypted the way LibreOffice encrypts (every file but the `mimetype` and manifest; each with its own salt and initialisation vector; SHA-256 checksums), which LibreOffice opens with the password. Flat OpenDocument text (`.fodt`: the whole document in one `office:document`, pictures inline as base64 `office:binary-data`, formulas inline) is opened and saved as a package is, both validating against the schema. Tables of contents and other indexes (`text:table-of-content`, `text:illustration-index`/`text:table-index`, `text:alphabetical-index`, `text:bibliography`) open as Word's `TOC` (levels from the source's `text:outline-level`; `\c` with the caption name for a table of figures), `INDEX` and `BIBLIOGRAPHY` fields — in the title paragraph when the index has one, as WordCraft inserts a table, else around the entries — so References › Update Table regenerates them; LibreOffice's Contents 1–10, Contents Heading and Figure Index 1 styles are WordCraft's TOC 1–9, TOC Heading and Table of Figures; WordCraft's tables are written back as ODF indexes with their source and entry templates (LibreOffice updates them), entries' links in the Index Link style; user and object indexes are read as their paragraphs; index marks (`text:alphabetical-index-mark`, Word's `XE`) are not read. Custom character styles (a common text style other than LibreOffice's link, note-mark and list-label styles kept as a character style with its name, parent and own formatting, its text in it; written back as common text styles), custom paragraph styles (a common style other than Standard, the kinds' and the note texts' kept as a document style with its name, parent and own formatting, its paragraphs in it rather than given its formatting directly; written back as common styles, named so LibreOffice keeps them), paragraph borders (each side's line and padding) and background, heading numbering (`text:outline-style`: each level's format, prefix, suffix, levels shown and start number the headings through their styles, as Word's numbered headings, and are written back), styles (the file's own Heading 1–6, Title, Quotations and Preformatted Text definitions give those styles' look on open — font, size, percent sizes included, bold, colour, spacing, alignment, keep with next — and saving writes the document's own style definitions rather than fixed ones), tab stops (left, centre, right, deLine truncated
 | `.txt` Plain text | 2% | R/W | ✅ | ✅ | ~95% | 1–2 | unit tests | Encoding detection. Files with other extensions (`.m3u`/`.m3u8` playlists, logs, config files, no extension) open as text when they are text, Word and RTF files by their signature; binary files are refused (#569). A Word or RTF extension that contradicts the content also opens by signature, as in Word: RTF saved as `.doc` (hh.ru résumés, accounting exports), a `.docx` renamed `.doc`, a Word 97-2003 file renamed `.docx`; a Word XML Document (Word 2003 XML or Flat OPC) or a web page (`<html>`, `<!DOCTYPE html>`) under a `.doc`, `.docx` or `.rtf` name opens as what it is (#2853, `tests::word_xml_and_web_pages_saved_as_doc_open_by_content`). Word's encoding choice dialog and line-ending options missing; such files save only through Save As |
 | `.htm/.html` Web Page and Web Page, Filtered | 1% | R/W | 🟡 | 🟡 | ~60% | 6–10 | `crates/formats/src/tests.rs` | Tables (#102), relative pictures embedded (#113), missing `</head>` tolerated (#154); the empty comments `<!-->` and `<!--->` end at once instead of swallowing the rest of the page (#5040). Header cells (`<th>`) bold unless their CSS says otherwise; `text-align` on a cell, or inherited from its row, row group or table, aligns the cell's paragraphs (#1381). HTML gives no page size, so it opens on the region's paper (A4 or Letter), as Markdown and plain text do; `@page` isn't read (#1381). No Word "Web Page" (with `_files` folder) round-trip. The same reader takes HTML from the system clipboard: Paste keeps another program's formatting (a Word document, a web page; Windows' "HTML Format" header understood), Merge Formatting keeps its emphasis (#687). A pasted `<blockquote>` (LibreOffice's paragraph indented on both sides) becomes a Normal paragraph indented by the page's `blockquote` margins, else 0.5 in each side; opening an .html file keeps it as the Quote style (#1270). Equations are written as MathML (with the linear format as a UnicodeMath annotation) and read back from MathML: our annotation, else the presentation elements, else a TeX annotation (#816). A copy of one equation alone also goes in the clipboard's MathML formats (Windows "MathML" and "MathML Presentation", macOS `public.mathml.presentation` and `public.mathml`; W3C MathML 3 §6.2.4), which Microsoft documents Word reading first when it pastes math (#1297; the paste into Word is not yet verified); Ruby (furigana, phonetic guides) is written as `<ruby>base<rt>reading</rt></ruby>` in the base text's formatting and read back from `<ruby>`/`<rb>`/`<rt>` (`<rp>` fallback parentheses dropped; malformed markup keeps its text), so docx/doc → HTML → doc keeps the annotation; HTML states no alignment, size or raise, so the Phonetic Guide's defaults apply (#1681)  CRLF and lone CR input newlines normalize before tokenization, preserving preformatted lines and leaving decoded character references separate (#4810). |
 | `.mht/.mhtml` Single File Web Page | <1% | R/W | ❌ | ❌ | 0% | 3–5 | — | |
@@ -279,6 +279,7 @@ Custom document properties retain their bookmark link targets through DOCX saves
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-11-01 | trivial | ODT: ruby (`text:ruby`) was read as its base and ruby text run together and written as plain text; it is read as a Phonetic Guide and written back as ODF ruby, which LibreOffice shows over its base (`odt::tests_more::ruby`) |
 | 2026-11-01 | trivial | ODT: a page break after a paragraph (lost, so a two-page document saved as one page), lines kept together, widow and orphan control, hyphenation (the document hyphenates when a paragraph does), a table's alignment and width and its rows' heights are read and written; a LibreOffice document with them round-trips at 573 px instead of 4 407 and keeps its pages (`odt::tests_more::flow_breaks`) |
 | 2026-11-01 | trivial | Layout: an in-line picture, shape or chart moves with its run's raise or lowering (Word's `w:position`), the line growing to hold it. ODT: an in-line frame centred on or hanging from the baseline keeps that place (read as that lowering, written back as `from-top`) instead of standing on the baseline; leading's extra space after the last line is kept; a text box's frame derives from the Frame style, without which LibreOffice ignored its border. LibreOffice round trips: shapes 13 864 → 1 273 px, spacing 2 973 → 706 px, text box 736 → 0 px (`layout::tests::an_inline_picture_moves_with_its_runs_position`, `odt::tests_more::floats::an_inline_frame_keeps_its_place_on_the_baseline`, `odt::tests_more::text_boxes::a_text_box_frame_derives_from_the_frame_style`) |
 | 2026-11-01 | trivial | ODT: form controls (`office:forms`, `draw:control`) — text fields, text areas, check boxes, radio buttons, list and combo boxes, date fields — were dropped with their values; they open as content controls (which save to DOCX as Word's) and are written back as form controls LibreOffice shows (`odt::tests_more::forms`, `odt_forms.rs`) |