[css-values] "fetch a style resource" should fall back to the CSSStyleSheet's location #12068

AtkinsSJ · 2025-04-11T10:42:49Z

In step 2 of "fetch a style resource" we have:

Let base be sheet’s stylesheet base URL if it is not null, otherwise environmentSettings’s API base URL. [CSSOM]

However, only stylesheets constructed from JS have a base URL set. For those that don't, I believe we should fall back to sheet's location, and only afterwards use the API base URL. As an example:

index.html

<!DOCTYPE html>
<style>
     @import url("data/sheet.css");
</style>
<div id="checkerboard"></div>

data/sheet.css

#checkerboard {
    background: url("image.png");
}

With the current algorithm, sheet has no base URL, so it would fall back to the API base URL, which is the document's location. It would thus try to load image.png instead of data/image.png. Inserting the sheet's location as a fallback means that it would load relative to data/sheet.css, and so get data/image.png.

The text was updated successfully, but these errors were encountered:

weinig · 2025-04-15T15:22:44Z

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

noamr · 2025-04-17T10:37:30Z

Makes sense, Happy to fix this once #12074 is merged (will do an overhaul of a few of these bugs in one go)

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[css-values] "fetch a style resource" should fall back to the CSSStyleSheet's location #12068

[css-values] "fetch a style resource" should fall back to the CSSStyleSheet's location #12068

AtkinsSJ commented Apr 11, 2025

weinig commented Apr 15, 2025

noamr commented Apr 17, 2025 •

edited

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[css-values] "fetch a style resource" should fall back to the CSSStyleSheet's location #12068

[css-values] "fetch a style resource" should fall back to the CSSStyleSheet's location #12068

Comments

AtkinsSJ commented Apr 11, 2025

index.html

data/sheet.css

weinig commented Apr 15, 2025

noamr commented Apr 17, 2025 • edited Loading

noamr commented Apr 17, 2025 •

edited

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