mcoktwone-azuatcuvpc.now.sh - The ordered list numbering is faulty

[webcompat-bot]

URL: https://mcoktwone-azuatcuvpc.now.sh/wiki/teleporter

Browser / Version: Firefox 68.0
Operating System: Windows 10
Tested Another Browser: Yes

Problem type: Something else
Description: ol list not correct in nightly
Steps to Reproduce:
the list results correctly in 1,2,3,4,5 in Firefox stable 66,but it results in 1,4,5,6,7 in Firefox Nightly 68.

Browser Configuration

• None

Reported by @jimchen5209

From webcompat.com with ❤️

[jimchen5209]

Browser used:

• Top-left: Edge Chromium
• Top-right: Firefox Nightly
• Bottom-left: Edge UWP
• Bottom-right: Chrome

[cipriansv]

Thanks for the report,
I was indeed able to reproduce the issue. The ordered list numbering is faulty on Firefox.

Tested with:
Browser / Version: Firefox Nightly 68.0a1 (2018-04-29), Chrome 74.0.3729.108
Operating System: Windows 10 Pro

This is the web page displayed in Firefox Nightly:

And this is the web page displayed in Chrome:

[karlcow]

Quite interesting. The markup is wrong.

<ol>
    <li>
      …
    </li>
    <ul>
        …
    </ul>
    <li>
      …
      <ul>
        <li>
          …
        </li>
        …
    </ul>
    </li>
    <li>
      …
    </li>

    …
</ol>

The first ul should be inside li.

So it seems the way Firefox parses that is breaking the numbering. This is a test case to illustrate it.

data:text/html,<ol><li><a href="">item 1</a></li><ul><li><a href="">subitem 1.1</a></li><li><a href="">subitem 1.2</a></li><li><a href="">subitem 1.3</a></li></ul><li><a href="">item 2</a><ul><li><a href="">subtitem 2.1</a></li></ul></li><li><a href="">item 3</a></li></ol>

and indeed this is working in Firefox 66. Let's find a mozregression.

mozregression --good 66 --bad 2019-04-20

ah this one is for @emilio and @MatsPalmgren
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=5dc0652cd024fef30217ac3e6087b7a32f16967f&tochange=9bad25ccc8d0414e21d3c8d4dcf2178a97bb07c3

Opening a core bug.

[karlcow]

Close as duplicate of https://bugzilla.mozilla.org/show_bug.cgi?id=1548753

[lock]

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