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Alternate Stylesheets in local HTML file?

  • 9 replies
  • 1 has this problem
  • 199 views
  • Last reply by Dante

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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?

Chosen solution

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.

Read this answer in context 👍 1

All Replies (9)

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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:

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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

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

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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!

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Chosen Solution

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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Thanks, again. I've done that here:

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

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

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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
```

Modified by cor-el

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

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