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I thought it was a good idea to edit the title of the following question: What is the source of this E̶r̶d̶ő̶s̶ quote?

I wanted to strike through (like this) the name Erdős, but apparently the html tag does not work for titles

<s>...</s>

Is this a bug or is this restriction intended? Is there a reason why we should not allow strike through of characters? The question What HTML tags are allowed on Stack Exchange sites? explains what subset of html is allowed in questions; what is the subset that is allowed for titles?

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    $\begingroup$ I retagged support instead of bug to avoid somebody else having to add a status-tag. $\endgroup$
    – user9072
    Commented Oct 26, 2013 at 14:12

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Reset to default
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This is by design. Already for comments the formatting one can use/that is not escaped is a lot more restricted see https://meta.mathoverflow.net/editing-help#comment-formatting. I think for titles really every HTML is escaped; I do not have a very clear source for this but see for example this meta.SO question Is it possible to use <sub>HTML</sub> in question titles?

For strike through specifically I believe (but not certain) you could do it using Unicode instead.

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