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gkatsev
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Apr 24, 2026
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there's a lot of whitespace changes below here that don't seem necessary
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ah, these are due to override with copy and paste from other TTWG repository...
will try to revert.
| License](http://www.w3.org/Consortium/Legal/2015/copyright-software-and-document). Contributions to | ||
| Specifications are made under the [W3C CLA](https://www.w3.org/community/about/agreements/cla/). | ||
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| All documents in this Repository are licensed by contributors under the [W3C Document License](http://www.w3.org/Consortium/Legal/copyright-documents). |
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Does this mean a licensing change? Is this required?
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For a long time we have deliberately used different licences for WebVTT vs the TTML-based specifications. We haven't decided to change that recently.
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actually, situation is quite messy
- CLA itself cannot be applied to TTWG, since it's dedicated to CG only
- the latest WebVTT /TR/ publication uses document license, but not software and document license, so I have definitely no idea why 2019 edition was published using document license neither why latter was used for this LICENSE.md file
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Need to have boilerplate PR (speced/bikeshed-boilerplate#197 ) merged before landing.
💥 Error: 422 Unprocessable Entity 💥
PR Preview failed to build. (Last tried on Apr 24, 2026, 7:49 AM UTC).
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Error output:
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webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_font_shorthand.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_namespace.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_outline_properties.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_outline_shorthand.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_text-decoration_line-through.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_text-shadow.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_timestamp_future.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_timestamp_past.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_transition_with_timestamp.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_white-space_normal_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_white-space_nowrap.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_white-space_pre-line_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_white-space_pre-wrap_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_white-space_pre_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_with_class.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/italic_object/italic_with_class_object_specific_selector.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_attribute.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/lang_object/lang_color.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/not_allowed_properties.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/not_root_selector.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/outline_properties.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/outline_shorthand.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/root_namespace.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/root_selector.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/text-decoration_line-through.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/text-decoration_overline.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/text-decoration_overline_underline_line-through.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/text-decoration_underline.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/text-shadow.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/type_selector_root.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_animation_with_timestamp.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_background_properties.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_background_shorthand.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_color.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_font_properties.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_font_shorthand.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_namespace.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_outline_properties.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_outline_shorthand.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_text-decoration_line-through.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_text-shadow.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_timestamp_future.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_timestamp_past.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_transition_with_timestamp.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_white-space_normal_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_white-space_nowrap.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_white-space_pre-line_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_white-space_pre-wrap_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_white-space_pre_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_with_class.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/underline_object/underline_with_class_object_specific_selector.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_animation_with_timestamp.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_background_properties.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_background_shorthand.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_color.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_font_properties.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_font_shorthand.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_namespace.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_outline_properties.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_outline_shorthand.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_text-decoration_line-through.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_text-shadow.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_timestamp_future.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_timestamp_past.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_transition_with_timestamp.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_voice_attribute.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_white-space_normal_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_white-space_nowrap.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_white-space_pre-line_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_white-space_pre-wrap_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_white-space_pre_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_with_class.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/voice_object/voice_with_class_object_specific_selector.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/white-space_normal_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/white-space_nowrap_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/white-space_pre-line_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/white-space_pre-wrap_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/white-space_pre.html\n webvtt/rendering/cues-with-video/processing-model/selectors/cue_function/white-space_pre_wrapped.html\n webvtt/rendering/cues-with-video/processing-model/selectors/default_styles/bold_object_default_font-style.html\n webvtt/rendering/cues-with-video/processing-model/selectors/default_styles/inherit_as_default_value_inherits_values_from_media_element.html\n webvtt/rendering/cues-with-video/processing-model/selectors/default_styles/italic_object_default_font-style.html\n webvtt/rendering/cues-with-video/processing-model/selectors/default_styles/underline_object_default_font-style.html\n webvtt/rendering/cues-with-video/processing-model/size_50.html\n webvtt/rendering/cues-with-video/processing-model/snap-to-line.html\n webvtt/rendering/cues-with-video/processing-model/too_many_cues.html\n webvtt/rendering/cues-with-video/processing-model/too_many_cues_wrapped.html" }, { "lineNum": "2552:4", "messageType": "warning", "text": "The var 'stylesheets' (in algorithm 'WebVTT parser algorithm') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "2822:8", "messageType": "warning", "text": "The var 'input' (in algorithm 'WebVTT region settings parsing') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "2830:84", "messageType": "warning", "text": "The var 'input' (in algorithm 'WebVTT region objects') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "2993:69", "messageType": "warning", "text": "The var 'regions' (in algorithm 'collect WebVTT cue timings and settings') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "3003:84", "messageType": "warning", "text": "The var 'input' (in algorithm 'parse the WebVTT cue settings') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "3032:88", "messageType": "warning", "text": "The var 'regions' (in algorithm 'parse the WebVTT cue settings') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "3448:19", "messageType": "warning", "text": "The var 'language' (in algorithm 'WebVTT cue text parsing rules') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4122:89", "messageType": "warning", "text": "The var 'cue' (in algorithm 'WebVTT rules for extracting the chapter\ntitle') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4128:32", "messageType": "warning", "text": "The var 'cue' (in algorithm 'WebVTT rules for extracting the chapter title') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4153:65", "messageType": "warning", "text": "The var 'language' (in algorithm 'Processing model') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4267:59", "messageType": "warning", "text": "The var 'language' (in algorithm 'rules for updating the display of WebVTT text tracks') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4344:78", "messageType": "warning", "text": "The var 'nodes' (in algorithm 'Processing cue settings') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4503:13", "messageType": "warning", "text": "The var 'left' (in algorithm 'apply WebVTT cue settings') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4503:54", "messageType": "warning", "text": "The var 'top' (in algorithm 'apply WebVTT cue settings') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4570:66", "messageType": "warning", "text": "The var 'max dimension' (in algorithm 'apply WebVTT cue settings') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4805:59", "messageType": "warning", "text": "The var 'video' (in algorithm 'Obtaining CSS boxes') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "5732:74", "messageType": "warning", "text": "The var 'startTime' (in algorithm 'VTTCue construction') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "5741:57", "messageType": "warning", "text": "The var 'text' (in algorithm 'VTTCue construction') is only used once.\nIf this is not a typo, please add an ignore='' attribute to the <var>." }, { "lineNum": "4072:24", "messageType": "link", "text": "Multiple possible 'ruby' element refs.\nArbitrarily chose https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-ruby-element\nTo auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:\nspec:html; type:element; text:ruby\nspec:html-ruby-extensions; type:element; text:ruby\n<a bs-line-number=\"4072:24\" data-link-type=\"element\" data-lt=\"ruby\">ruby</a>" }, { "lineNum": "4076:24", "messageType": "link", "text": "Multiple possible 'rt' element refs.\nArbitrarily chose https://html.spec.whatwg.org/multipage/text-level-semantics.html#the-rt-element\nTo auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:\nspec:html; type:element; text:rt\nspec:html-ruby-extensions; type:element; text:rt\n<a bs-line-number=\"4076:24\" data-link-type=\"element\" data-lt=\"rt\">rt</a>" }, { "lineNum": "4168:43", "messageType": "link", "text": "Multiple possible 'audio' element refs.\nArbitrarily chose https://html.spec.whatwg.org/multipage/media.html#audio\nTo auto-select one of the following refs, insert one of these lines into a <pre class=link-defaults> block:\nspec:html; type:element; text:audio\nspec:epub-34; type:element; text:audio\n<a bs-line-number=\"4168:43\" data-link-type=\"element\" data-lt=\"audio\">audio</a>" }, { "lineNum": "4886:8", "messageType": "link", "text": "No 'property' refs found for 'font-style' with spec 'css-fonts-3'.\n'font-style'" }, { "lineNum": "4889:8", "messageType": "link", "text": "No 'property' refs found for 'font-weight' with spec 'css-fonts-3'.\n'font-weight'" }, { "lineNum": "5953:30", "messageType": "link", "text": "No 'dfn' refs found for 'responsible document'.\n<a bs-line-number=\"5953:30\" data-link-type=\"dfn\" data-lt=\"responsible document\">responsible document</a>" }, { "lineNum": "774:6", "messageType": "lint", "text": "Unexported dfn that's not referenced locally - did you mean to export it?\n<dfn bs-line-number=\"774:6\" data-dfn-type=\"dfn\" id=\"user-agents-that-support-a-full-html-css-engine\" data-lt=\"User agents that support a full HTML CSS engine\" data-noexport=\"by-default\" class=\"dfn-paneled\">User agents that support a full HTML CSS engine</dfn>" }, { "lineNum": null, "messageType": "failure", "text": "Did not generate, due to errors exceeding the allowed error level." } ]This seems to be an issue with the Spec Generator service. PR Preview doesn't manage this service and so has no control over it. If you've identified an issue with it, you can report the issue to the maintainers of Spec Generator directly. Please be courteous. Thank you!
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