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Provide more context around the permissibility of the XHTML slash on void elements #9642

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Provide more context around the permissibility of the XHTML slash on void elements #9642

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12 changes: 8 additions & 4 deletions source
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Expand Up @@ -117428,10 +117428,14 @@ dictionary <dfn dictionary>StorageEventInit</dfn> : <span>EventInit</span> {
data-x="foreign elements">foreign element</span>, then there may be a single U+002F SOLIDUS
character (/), which on <span>foreign elements</span> marks the start tag as self-closing. On
<span>void elements</span>, it does not mark the start tag as self-closing but instead is
unnecessary and has no effect of any kind. For such void elements, it should be used only with
caution — especially since, if directly preceded by an <a href="#unquoted">unquoted attribute
value</a>, it becomes part of the attribute value rather than being discarded by the
parser.</li>.
unnecessary, has no effect of any kind, and is permitted merely to facilitate migration from
XHTML. Newly-created markup that does not have a connection to XHTML is expected not to use it
on <span>void elements</span>, and the <span>HTML fragment serialization algorithm</span> does
not generate it on <span>void elements</span>. The U+002F SOLIDUS character (/) interacts poorly
with another syntax feature: if directly preceded by an <a href="#unquoted">unquoted attribute
value</a>, it becomes part of the attribute value rather than being discarded by the parser on
<span>void elements</span> or marking a <span data-x="foreign elements">foreign element</span> as
self-closed.</li>.

<li>Finally, start tags must be closed by a U+003E GREATER-THAN SIGN character (&gt;).</li>
</ol>
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