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Merged
palemieux merged 1 commit into from
Oct 5, 2026
Merged

Add support for tts:fontVariant #286

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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -105,6 +105,7 @@ The headless script [src/test/script/gen-render-package.mjs](src/test/script/gen
```sh
npm run gen-imsc1
npm run gen-imsc1_1
npm run gen-imsc1_3
```

[src/test/script/compare_renders.py](src/test/script/compare_renders.py) compares two such render outputs (unzipped), performing byte-level, JSON/HTML and pixel-level PNG diffs, and optionally generating an HTML comparison report.
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1 change: 1 addition & 0 deletions package.json
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Expand Up @@ -49,6 +49,7 @@
"prepublishOnly": "npm run build",
"gen-imsc1": "node src/test/script/gen-render-package.mjs imsc-tests/imsc1 build/renders-imsc1.zip",
"gen-imsc1_1": "node src/test/script/gen-render-package.mjs imsc-tests/imsc1_1 build/renders-imsc1_1.zip",
"gen-imsc1_3": "node src/test/script/gen-render-package.mjs imsc-tests/imsc1_3 build/renders-imsc1_3.zip",
"gen-reference-files": "node src/test/script/gen-reference-files.mjs",
"install:firefox": "puppeteer browsers install firefox",
"lint": "eslint .",
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25 changes: 25 additions & 0 deletions src/main/js/html.js
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Expand Up @@ -1512,6 +1512,31 @@ const STYLING_MAP_DEFS = [
dom_element.style.fontStyle = attr;
},
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling fontVariant",
function (context, dom_element, isd_element, attr) {

/*
* font-variant-position is not used since some browsers do not
* synthesize sub/superscript glyphs when the font does not provide
* them.
*
* vertical-align/font-size are applied only to spans that contain
* text to avoid accumulating baseline offsets and smaller font
* size.
*
* The sub/superscript font size is 70% of the normal font size.
*/

if (!isd_element.text || attr === "normal") return;

dom_element.style.verticalAlign = attr;

const fs = isd_element.styleAttrs[byName.fontSize.qname];

dom_element.style.fontSize = (fs.toUsedLength(context.w, context.h) * 0.70) + "px";
},
),
new HTMLStylingMapDefinition(
"http://www.w3.org/ns/ttml#styling fontWeight",
function (context, dom_element, isd_element, attr) {
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17 changes: 17 additions & 0 deletions src/main/js/styles.js
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Expand Up @@ -297,6 +297,23 @@ export const all = [
},
null,
),
new StylingAttributeDefinition(
ns_tts,
"fontVariant",
"normal",
["span"],
true,
true,
function (str) {
if (str === "normal" || str === "sub" || str === "super") {

return str;
}

return null;
},
null,
),
new StylingAttributeDefinition(
ns_tts,
"fontWeight",
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64 changes: 64 additions & 0 deletions src/test/js/FontVariantTest.js
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@@ -0,0 +1,64 @@
import { equal } from "node:assert";
import { test } from "node:test";
import { generateISD } from "../../main/js/isd.js";
import { getIMSC1Document } from "./utils/getIMSC1Document.js";

const FONT_VARIANT_QNAME = "http://www.w3.org/ns/ttml#styling fontVariant";

test("tts:fontVariant", async () => {
const doc = await getIMSC1Document("./src/test/resources/unit-tests/fontVariant.ttml");

const isd = generateISD(doc, 1);
const p = isd.contents[0].contents[0].contents[0].contents[0];

/* not applicable to p */

equal(FONT_VARIANT_QNAME in p.styleAttrs, false);

/* initial value */

equal(p.contents[0].styleAttrs[FONT_VARIANT_QNAME], "normal");
equal(p.contents[2].styleAttrs[FONT_VARIANT_QNAME], "normal");

/* explicit super, inherited by nested span */

const sup = p.contents[1];

equal(sup.styleAttrs[FONT_VARIANT_QNAME], "super");
equal(sup.contents[0].styleAttrs[FONT_VARIANT_QNAME], "super");
equal(sup.contents[1].styleAttrs[FONT_VARIANT_QNAME], "super");

/* explicit sub */

equal(p.contents[3].styleAttrs[FONT_VARIANT_QNAME], "sub");

/* inherited through p, even though not applicable to p */

const p2 = isd.contents[0].contents[0].contents[0].contents[1];

equal(FONT_VARIANT_QNAME in p2.styleAttrs, false);
equal(p2.contents[0].styleAttrs[FONT_VARIANT_QNAME], "sub");
equal(p2.contents[1].styleAttrs[FONT_VARIANT_QNAME], "normal");
});

test("tts:fontVariant (imsc-tests fontVariant001)", async () => {
const doc = await getIMSC1Document("./src/test/resources/imsc-tests/imsc1_3/ttml/fontVariant/fontVariant001.ttml");

const isd = generateISD(doc, 0);
const div = isd.contents[0].contents[0].contents[0];

const expected = [
["normal", "super", "normal", "super", "normal"],
["normal", "sub", "normal", "sub", "normal"],
];

for (let i = 0; i < expected.length; i++) {
const spans = div.contents[i].contents;

equal(spans.length, expected[i].length);

for (let j = 0; j < expected[i].length; j++) {
equal(spans[j].styleAttrs[FONT_VARIANT_QNAME], expected[i][j]);
}
}
});
2 changes: 1 addition & 1 deletion src/test/js/GenerateReferenceFilesTest.js
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Expand Up @@ -8,7 +8,7 @@ import { renderTestSuite } from "../script/render-harness.mjs";
const __dirname = path.dirname(fileURLToPath(import.meta.url));
const REFERENCE_FILES_ROOT = path.resolve(__dirname, "..", "resources", "reference-files");

const REFFILES_ROOTS = ["imsc-tests/imsc1", "imsc-tests/imsc1_1"];
const REFFILES_ROOTS = ["imsc-tests/imsc1", "imsc-tests/imsc1_1", "imsc-tests/imsc1_3"];

async function listFilesRecursively(dir) {
const entries = await fs.readdir(dir, { withFileTypes: true, recursive: true });
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2 changes: 1 addition & 1 deletion src/test/resources/imsc-tests
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Submodule imsc-tests updated 16 files
+ − imsc1/png/Animation017/0.000000.png
+ − imsc1/png/Animation017/10.000000.png
+ − imsc1/png/Animation017/5.000000.png
+ − imsc1/png/FillLineGap005/0.000000.png
+ − imsc1/png/FillLineGap005/30.000000.png
+3 −3 imsc1/tests.json
+0 −27 imsc1/ttml/animation/Animation017.ttml
+2 −2 imsc1/ttml/fillLineGap/FillLineGap002.ttml
+32 −0 imsc1/ttml/fillLineGap/FillLineGap005.ttml
+2 −8 imsc1/ttml/opacity/Opacity004.ttml
+ − imsc1_1/png/ruby006/0.000000.png
+ − imsc1_1/png/ruby006/1.000000.png
+4 −4 imsc1_1/ttml/ruby/ruby006.ttml
+ − imsc1_3/png/fontVariant001/0.000000.png
+5 −0 imsc1_3/tests.json
+25 −0 imsc1_3/ttml/fontVariant/fontVariant001.ttml
3 changes: 3 additions & 0 deletions src/test/resources/reference-files/imsc1/ActiveArea001/isd/0.000000.json
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Expand Up @@ -148,6 +148,7 @@
"rh": 0.05
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
Expand Down Expand Up @@ -333,6 +334,7 @@
"rh": 0.05
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
Expand Down Expand Up @@ -518,6 +520,7 @@
"rh": 0.05
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation001/isd/0.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation001/isd/5.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation002/isd/0.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation002/isd/5.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation003/isd/5.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation004/isd/0.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation004/isd/5.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation007/isd/0.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation007/isd/5.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "bold",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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2 changes: 2 additions & 0 deletions src/test/resources/reference-files/imsc1/Animation008/isd/0.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
Expand Down Expand Up @@ -200,6 +201,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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2 changes: 2 additions & 0 deletions src/test/resources/reference-files/imsc1/Animation008/isd/5.000000.json
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Expand Up @@ -150,6 +150,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
Expand Down Expand Up @@ -203,6 +204,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation012/isd/0.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation012/isd/10.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation012/isd/16.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation012/isd/5.000000.json
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Expand Up @@ -147,6 +147,7 @@
"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation013/isd/0.000000.json
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"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation013/isd/2.000000.json
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"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation013/isd/4.000000.json
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"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation013/isd/6.000000.json
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"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation014/isd/0.000000.json
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"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation014/isd/5.000000.json
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"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation015/isd/0.000000.json
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"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation015/isd/3.000000.json
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"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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1 change: 1 addition & 0 deletions src/test/resources/reference-files/imsc1/Animation015/isd/8.000000.json
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"rh": 0.06666666666666667
},
"http://www.w3.org/ns/ttml#styling fontStyle": "normal",
"http://www.w3.org/ns/ttml#styling fontVariant": "normal",
"http://www.w3.org/ns/ttml#styling fontWeight": "normal",
"http://www.w3.org/ns/ttml#styling textCombine": "none",
"http://www.w3.org/ns/ttml#styling textDecoration": [
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