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[css-images] [css-values] Fetch algorithms require a style sheet, which may not exist #12065

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AtkinsSJ opened this issue Apr 10, 2025 · 2 comments
Open

[css-images] [css-values] Fetch algorithms require a style sheet, which may not exist #12065

AtkinsSJ opened this issue Apr 10, 2025 · 2 comments

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@AtkinsSJ
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"fetch a style resource" and thus "fetch an external image for a stylesheet" require a non-null CSSStyleSheet. However, there may not be such a sheet. Specifically, presentational hints and style attributes.

For example:

<body background="image.png">

Here the background attribute sets background-image:

When a body element has a background attribute set to a non-empty value [...] the user agent is expected to treat the attribute as a presentational hint setting the element's 'background-image' property to the return value.
https://html.spec.whatwg.org/multipage/rendering.html#the-page:attr-background

As another example, inline styles:

<div style="background-image: url('image.png')">

As far as I'm aware, neither of these have a CSSStyleSheet object associated with them. Seems like we should probably fall back to using the Document's base URL in these cases.
@weinig
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weinig commented Apr 15, 2025

cc @fantasai, @tabatkins, @noamr, @annevk

@noamr
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noamr commented Apr 17, 2025

We should pass either a sheet or an element here.
Happy to work on a PR once #12074 is merged.

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@noamr @AtkinsSJ @weinig