<del> tags causing paragraph break when used with a certain combination of headings, categories and links
Closed, ResolvedPublic
Actions

Assigned To

Authored By

	MrStradivarius
	Apr 12 2015, 1:43 AM

Description

A bit of a head-scratcher, this one.

If you save the following wikitext, it produces paragraph breaks between "bar", "baz" and "qux":

=== Example heading ===
[[Category:Foo]]
[[bar]]<del>baz</del>qux

Here's the generated HTML:

<h3><span class="mw-headline" id="Example_heading">Example heading</span></h3>
<p><a href="/wiki/Bar" title="Bar" class="mw-disambig">bar</a></p>
<del>baz</del>
<p>qux</p>

I'd expect "foo", "bar" and "baz" to be inside the same <p></p> tags. This behaviour is fragile, as well. If you remove the heading, or the category, or stop "bar" from being a link, or use <s></s> tags instead of <del></del> tags, "foo", "bar" and "baz" all appear in the same set of <p></p> tags as expected.

This was also reported on enwiki's village pump here (permanent link).

Related Objects

Mentioned Here: T89331: Replace HTML4 Tidy in MW parser with an equivalent HTML5 based tool

Event Timeline

MrStradivarius created this task.Apr 12 2015, 1:43 AM

MrStradivarius raised the priority of this task from to Needs Triage.

MrStradivarius updated the task description. (Show Details)

MrStradivarius added a project: MediaWiki-Parser.

MrStradivarius subscribed.

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptApr 12 2015, 1:43 AM

Another example reported at https://en.wikipedia.org/wiki/Template_talk:Rfc#Formatting_bug:

{|
|}
[[Category:X1]]
[[Wikilink]] <del>redacted</del>

This produces:

<table>
<tr>
<td></td>
</tr>
</table>
<p><a href="/wiki/Wikilink" title="Wikilink" class="mw-redirect">Wikilink</a></p>
<del>redacted</del>

Also, the bug didn't appear when I used Special:ExpandTemplates with the two wikitext examples above. It only seems to happen on the live site.

After more testing, it seems that the top-most wikitext can be any wikitext that produces a block-level element. This code also triggers the bug:

<div>Block-level</div>
[[Category:Foo]]
[[bar]]<del>baz</del>

This is tidy cleaning up. It does this probably due to the exceptional paragraphing behavior of ins and del described in the spec: https://html.spec.whatwg.org/multipage/semantics.html#edits-and-paragraphs

Let's hope T89331 can help....

Tidy's enclose-text and enclose-block-text options both do this.

Aklapper triaged this task as Lowest priority.Apr 13 2015, 9:06 AM

Fixed by Remex. Tested the first two examples.

<del> tags causing paragraph break when used with a certain combination of headings, categories and linksClosed, ResolvedPublicActions

Description

Related Objects

Event Timeline

<del> tags causing paragraph break when used with a certain combination of headings, categories and links
Closed, ResolvedPublic
Actions