use script's baseurl for cssstylesheets

[keithamus]

This aligns the spec to Chrome's implementation and WPTs found in web-platform-tests/wpt#29408, by setting the baseUrl of the CSSStyleSheet to be that of the script module's baseUrl.

Refs #11629

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/webappapis.html ( diff )

[annevk]

Would be good if @nicolo-ribaudo reviewed this too. And maybe @dandclark.

[annevk]

Suggested change

	<code>CSSStyleSheet</code></span> with a dictionary with:
	<code>CSSStyleSheet</code></span> with

(might have to line break differently after applying this)

[keithamus]

Ahh I see, thanks!

[keithamus]

I don't mind changing the line wrapping but the entire «[ .* ]» chunk will not fit on the 100 column break point on the line above, so it feels right to keep it on one line.

I see other examples do break on «[, so I can put that on the line above, but it feels odd to me.

[annevk]

I think we do break inside literals just like we break on whitespace elsewhere, but it might not matter much if we end up applying @zcorpan's rewrapper script.

[dandclark]

Not sure script's baseURL is valid here -- we just created script in the first step of this algorithm and haven't initialized that field yet.

I see that other "create a module script" algos take the baseURL as a parameter, e.g. see create a javascript module script. It looks to me like "create a CSS module script" also needs that parameter. We'd pass in the "response's URL" as the baseURL here in the same way as is done for WASM module scripts and JS module scripts nearby.

It's a little more plumbing than I thought it'd be in #11629 (comment) but I hadn't realized at the time that the CSS module script's baseURL just gets set to null.