WHATWG
2022-01-28
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00:22
<TabAtkins>
Andreu Botella (he/they): Ugh, indeed, the sidebar's background color is manually specified with the assumption of light mode. I'll fix.
01:43
<sideshowbarker>
FYI https://github.com/WICG/proposals/issues/46
14:12
<annevk>
Jake Archibald: have you ever seen service workers create JSON responses? Trying to figure out browser interest for https://github.com/whatwg/fetch/issues/1389
14:32
<Luca Casonato>

annevk: I am I correct in thinking that according to the mime spec, the following mime types should parse like this?

  • text/html;in]valid=asd -> text/html
  • text/html;in]valid=asd;foo=bar -> text/html;foo=bar
14:32
<Luca Casonato>
All browser engines just accept this invalid name as valid.
14:34
<Luca Casonato>
Which brings me to this highly depressing page: https://wpt.fyi/results/mimesniff/mime-types?label=experimental&label=master&product=chrome&product=firefox&product=safari&aligned&q=mimesniff. Not even half of the tests pass in any browser
15:54
<annevk>
I think that's mostly due to Blob/Request/Response not having been updated accordingly
15:56
<annevk>
Luca Casonato: and yeah, not all invalid MIME types yield failure, same as with HTML and URLs
15:57
<annevk>
At least in the web platform "does it parse?" and "is it valid?" can have different answers
17:37
<Luca Casonato>
I think that's mostly due to Blob/Request/Response not having been updated accordingly
Ah ok, that makes sense.
19:20
<Domenic>

annevk: I am I correct in thinking that according to the mime spec, the following mime types should parse like this?

  • text/html;in]valid=asd -> text/html
  • text/html;in]valid=asd;foo=bar -> text/html;foo=bar
You can test current spec using https://npm.runkit.com/whatwg-mimetype . Maybe we should make a live-mime-viewer page...
22:42
<Luca Casonato>
You can test current spec using https://npm.runkit.com/whatwg-mimetype . Maybe we should make a live-mime-viewer page...

Thanks, that's pretty much what I did ultimately. Ran the following in my Deno repl:

import MIMEType from "https://esm.sh/whatwg-mimetype";
console.log(new MIMEType("text/html;a]=bar;b[=bar;c=bar").toString());
// text/html;c=bar
console.log(new MIMEType('text/html;valid=";";foo=bar').toString());
// text/html;valid=";";foo=bar
console.log(new MIMEType('text/html;in]valid=";";foo=bar').toString());
// text/html;foo=bar