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Incorrect HTML output for code span containing </> #1528

Description

@dbader

In markdown==3.8, a code span containing the string "`</>`" is incorrectly rendered. Instead of producing the expected HTML output with the characters escaped, it strips the content entirely:

>>> import markdown
>>> markdown.__version__
'3.8'

>>> markdown.markdown('`</>`')
'<p>``</p>'

Expected result:

`'<p><code>&lt;/&gt;</code></p>'`

Other examples that work correctly:

>>> markdown.markdown('`<`')
✅ '<p><code>&lt;</code></p>'
>>> markdown.markdown('`</`')
✅ '<p><code>&lt;/</code></p>'
>>> markdown.markdown('`</>`')
❌ '<p>``</p>'
>>> markdown.markdown('`/>`')
✅ '<p><code>/&gt;</code></p>'
>>> markdown.markdown('`>`')
✅ '<p><code>&gt;</code></p>'

This issue appears specific to the combination </>. Would appreciate any insight into whether this is a known bug, an edge case in the parser, or an intentional (though surprising) behavior. Thanks!

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