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link element attribute values as="{json,script,style}" for modulepreload
caugner
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Feb 18, 2026
caugner
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Feb 20, 2026
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Let's add bugs for Firefox and Safari.
Co-authored-by: Claas Augner <495429+caugner@users.noreply.github.com>
Co-authored-by: Claas Augner <495429+caugner@users.noreply.github.com>
Co-authored-by: Claas Augner <495429+caugner@users.noreply.github.com>
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Summary
This change adds
as="style",as="script", andas="json"to the<link rel="modulepreload">compat data. Chromium is shipping this in 147, so this adds that data as well (see https://chromestatus.com/feature/5202661416763392).Test results and supporting details
as="script"is the default, and support for this goes back to when each browser originally supported<link rel="modulepreload">. Chrome 147 will begin supportingas="style"andas="json", and Safari recently added support foras="json", in version 26.2 (see "Fixed “text/json/json+json” to be considered an invalid JSON MIME type." note in https://developer.apple.com/documentation/safari-release-notes/safari-26_2-release-notes).WPT tests reflecting these results:
For Chrome 147 supporting JSON and style modulepreloads, see Experimental results: https://wpt.fyi/results/preload/modulepreload-as.html?label=master&label=experimental&aligned&q=modulepreload-as.html
For Safari 26 supporting JSON modulepreloads, see https://wpt.fyi/results/preload/modulepreload-as.html?label=stable&label=master&aligned
https://chromestatus.com/feature/5202661416763392
https://developer.apple.com/documentation/safari-release-notes/safari-26_2-release-notes
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