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Alternate Stylesheets in local HTML file?

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  • Ultima risposta di Dante

It seems that Firefox on Win10 does not present alternate stylesheets in local files.

See for example: https://www.w3.org/Style/Examples/007/alternatives

I have a trivial HTML file, e.g., c:\alternate_stylesheet.html, with a few of those examples of alternative stylesheets, like:

 <link rel="alternate stylesheet"
       type="text/css"
       href="http://www.w3.org/StyleSheets/Core/Steely" title=Steely>
 <link rel="alternate stylesheet"
       type="text/css"
       href="http://dbaron.org/style/forest" title="Forest (by David Baron)">

Viewing such a trivial HTML page in Firefox on Win10, the View > Page Style list is the default - just "No Style" and "Basic Page Style". The list does not include the head link alternate stylesheet options.

Why not?

IE has no trouble with these (menu View > Style presents them as expected), which seems to confirm that the trivial HTML code is correct.

Any advice?

It seems that Firefox on Win10 does not present alternate stylesheets in local files. See for example: https://www.w3.org/Style/Examples/007/alternatives I have a trivial HTML file, e.g., c:\alternate_stylesheet.html, with a few of those examples of alternative stylesheets, like: <link rel="alternate stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/Core/Steely" title=Steely> <link rel="alternate stylesheet" type="text/css" href="http://dbaron.org/style/forest" title="Forest (by David Baron)"> Viewing such a trivial HTML page in Firefox on Win10, the View > Page Style list is the default - just "No Style" and "Basic Page Style". The list does not include the head link alternate stylesheet options. Why not? IE has no trouble with these (menu View > Style presents them as expected), which seems to confirm that the trivial HTML code is correct. Any advice?

Soluzione scelta

Dante said

I at least see a hint that the fix could be released in v78.1.0.

That fix will come in:

  • Regular release channel: Firefox 79.0
  • Extended Support Release (ESR) channel: Firefox 78.1.0esr

But I looked at a locally saved copy of the W3C page in Firefox Developer Edition, which is a beta of Firefox 79, and I don't see the alternate stylesheets listed there. Same with Firefox Nightly, which is an early test version of Firefox 80. So I think you definitely need to file a separate bug about those stylesheets not being listed for pages opened on file:// URLs.

There were some new isolation measures for file:// URLs in recent versions, so it might be a loose end no one noticed when implementing those changes.

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Hmm, the developer tools show that Firefox retrieves the style sheets, so I'm not sure why they aren't exposed on the menu.

You could file a bug:

I can use the Style Editor to disable the default stylesheet and enable one of the other style sheets.

  • https://media.prod.mdn.mozit.cloud/samples/cssref/altstyles/index.html

See also: bug 1645789 - "Basic Page Style" entry in the View > Page Style menu doesn't work reliably

Thanks for the confirmations. But 1645789 may fix this. I'm not quite sure how to read the bug report, but I at least see a hint that the fix could be released in v78.1.0. I'm not "up to date" with 78.0.1.

If v78.1 doesn't fix this for me, I'll submit a new bug report.

Thank you both!

Soluzione scelta

Dante said

I at least see a hint that the fix could be released in v78.1.0.

That fix will come in:

  • Regular release channel: Firefox 79.0
  • Extended Support Release (ESR) channel: Firefox 78.1.0esr

But I looked at a locally saved copy of the W3C page in Firefox Developer Edition, which is a beta of Firefox 79, and I don't see the alternate stylesheets listed there. Same with Firefox Nightly, which is an early test version of Firefox 80. So I think you definitely need to file a separate bug about those stylesheets not being listed for pages opened on file:// URLs.

There were some new isolation measures for file:// URLs in recent versions, so it might be a loose end no one noticed when implementing those changes.

Thanks, again. I've done that here:

https://bugzilla.mozilla.org/show_bug.cgi?id=1650603

I did a quick test.
It works in Firefox 66.0.5, but Firefox 67.0.4 is broken.

Note that it is better to attach a test file instead of pasting the code in a reply and even then you can use markup code (indent with four spaces or use backticks `code` or three backticks to enclose a block).

```
code
```

Modificato da cor-el il

thanks for the clear guidance. much appreciated, as this is new territory for me.