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html: Check the <source> MIME type on the source set updating (#39353)

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Follow the HTML specification and check if the source element's MIME
type
('type' attribute) is supported while updating the source set of the
image element (step 5.8)
https://html.spec.whatwg.org/multipage/#update-the-source-set

Also add the missing descriptions for steps for the old and new methods:
- selecting an image source
- creating a source set from attributes
- updating the source set
- normalizing the source densities

Testing: Improvements in the following tests
-
html/semantics/embedded-content/the-img-element/update-the-source-set.html
- resource-timing/initiator-type/picture.html

Fixes: #36675

Signed-off-by: Andrei Volykhin <andrei.volykhin@gmail.com>
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Andrei Volykhin 2025-09-19 21:34:37 +03:00 • committed by GitHub
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commit c017420ee7
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3 changed files with 176 additions and 142 deletions
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21
tests/wpt/meta/html/semantics/embedded-content/the-img-element/update-the-source-set.html.ini vendored
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@ -1,21 +0,0 @@
[update-the-source-set.html]
[<picture><source srcset="data:,b" type=""><img src="data:,a" data-expect="data:,b"></picture>]
expected: FAIL
[<picture><source srcset="data:,b" type=" "><img src="data:,a" data-expect="data:,b"></picture>]
expected: FAIL
[<picture><source srcset="data:,b" type=" image/gif"><img src="data:,a" data-expect="data:,b"></picture>]
expected: FAIL
[<picture><source srcset="data:,b" type="image/gif "><img src="data:,a" data-expect="data:,b"></picture>]
expected: FAIL
[<picture><source srcset="data:,b" type="image/gif;encodings"><img src="data:,a" data-expect="data:,b"></picture>]
expected: FAIL
[<picture><source srcset="data:,b" type="image/*"><img src="data:,a" data-expect="data:,a"></picture>]
expected: FAIL
[<picture><source srcset="data:,b" type="image/foobarbaz"><img src="data:,a" data-expect="data:,a"></picture>]
expected: FAIL

3
tests/wpt/meta/resource-timing/initiator-type/picture.html.ini vendored
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@ -1,3 +0,0 @@
[picture.html]
[The initiator type for <img> in a <picture> must be 'img']
expected: FAIL