After discussing this on the API OWNER meeting I have a few questions and suggestions.

My main concern is that we don't have full understanding of the compatibility risk. We believe this is rare, but do we have any hard data to confirm that? If not, would it be possible to add a targetted use counter that counts the cases where a page tries to use a broken blob?

I think you should also request formal signals from Gecko and WebKit since this is not exactly what they have done. It seems from what you write that we're getting something very slightly different (which also means that what seems to work for them might still break in Chromium).

/Daniel

On 2024-12-10 03:29, Domenic Denicola wrote:
LGTM1, nice work on all the spec changes here!

Please send a web platform tests PR to remove the .tentative.html from the test filenames.

On Tue, Dec 10, 2024 at 10:49 AM Gregg Tavares <g...@chromium.org> wrote:

    Sorry if I'm not up on all of the latest. I have several sites
    that use blobs in iframes to implement user code execution (think
    JSFiddle/Codepen). Do I need to be worried?

    Some use top-level->iframe(blob-from-top-level). Others use
    top-level->iframe(3rd-party)->iframe(blob-from-3rd-party)

    They all currently work across browsers so I'm guessing I don't
    need to worry if Firefox and Safari already implement this.

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