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Title:
[css-values-3] Serialisation of empty url() undefined Β· Issue #6447 Β· w3c/csswg-drafts
Description:
https://drafts.csswg.org/css-values-3/#url-empty, with tests at https://github.com/web-platform-tests/wpt/blob/master/css/css-values/urls/empty.html This section states: If the value of the url() is the empty string (like url("") or url(...
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/web-platform-tests/wpt/blob/master/css/css-values/urls/empty [css-values-3] serialisation css-values-3 type [css-values-4] css working group assuming commenter satisfied current implementation status full irc log comment metadata assignees abstract invalid resource empty url behaviour add tests url resolution parts type projects empty urls empty url serialize projects milestone wg resolution tests relative urls fragment urls invalid resource empty string empty url resolution / edits invalid webkit csswg //drafts section states preceding paragraph discussed serialization milestone relationships absolute url https implemented e051892 undefined completed sign invalid //github github url serialize implemented sign skip jump html resolve similar define
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- [css-values-4] How does an empty url serialize?
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DiscussionForumPosting:
context:https://schema.org
headline:[css-values-3] Serialisation of empty url() undefined
articleBody:https://drafts.csswg.org/css-values-3/#url-empty, with tests at https://github.com/web-platform-tests/wpt/blob/master/css/css-values/urls/empty.html
This section states:
> If the value of the url() is the empty string (like url("") or url()), the url must resolve to an invalid resource (similar to what the url about:invalid does).
This doesn't appear to define what the computed value of an empty url() is, thus it would appear to be undefined. The tests (by @Emilio) assert that the value _is_ `about:invalid`, rather than it merely being similar to it (resolving to an abstract invalid resource).
Compare with, under Relative URLs above:
> When a `<url>` appears in the computed value of a property, it is resolved to an absolute URL, as described in the preceding paragraph. The computed value of a URL that the UA cannot resolve to an absolute URL is the specified value.
Current implementation status is:
* Blink has not implemented https://github.com/w3c/csswg-drafts/commit/e0518924c87638861e6b89cc303667b9421cf152 (which changed the empty URL behaviour)
* Gecko has, and uses `about:invalid`
* WebKit has not implemented the change
author:
url:https://github.com/gsnedders
type:Person
name:gsnedders
datePublished:2021-07-13T20:41:04.000Z
interactionStatistic:
type:InteractionCounter
interactionType:https://schema.org/CommentAction
userInteractionCount:2
url:https://github.com/6447/csswg-drafts/issues/6447
context:https://schema.org
headline:[css-values-3] Serialisation of empty url() undefined
articleBody:https://drafts.csswg.org/css-values-3/#url-empty, with tests at https://github.com/web-platform-tests/wpt/blob/master/css/css-values/urls/empty.html
This section states:
> If the value of the url() is the empty string (like url("") or url()), the url must resolve to an invalid resource (similar to what the url about:invalid does).
This doesn't appear to define what the computed value of an empty url() is, thus it would appear to be undefined. The tests (by @Emilio) assert that the value _is_ `about:invalid`, rather than it merely being similar to it (resolving to an abstract invalid resource).
Compare with, under Relative URLs above:
> When a `<url>` appears in the computed value of a property, it is resolved to an absolute URL, as described in the preceding paragraph. The computed value of a URL that the UA cannot resolve to an absolute URL is the specified value.
Current implementation status is:
* Blink has not implemented https://github.com/w3c/csswg-drafts/commit/e0518924c87638861e6b89cc303667b9421cf152 (which changed the empty URL behaviour)
* Gecko has, and uses `about:invalid`
* WebKit has not implemented the change
author:
url:https://github.com/gsnedders
type:Person
name:gsnedders
datePublished:2021-07-13T20:41:04.000Z
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url:https://github.com/6447/csswg-drafts/issues/6447
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name:gsnedders
url:https://github.com/gsnedders
name:gsnedders
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interactionType:https://schema.org/CommentAction
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