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Add minimize a supported MIME type for Fetch and Resource Timing #171

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May 4, 2023
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Add minimize a supported MIME type for Fetch and Resource Timing #171

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Add minimize a supported MIME type for Fetch and Resource Timing
annevk Apr 27, 2023
8e55876
Update mimesniff.bs
annevk Apr 27, 2023
f755144
clarify SVG case
annevk May 4, 2023
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30 changes: 29 additions & 1 deletion mimesniff.bs
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Expand Up @@ -198,9 +198,37 @@ confusion with the use of <i>media type</i> as described in <cite>Media Queries<
<p>A <a>MIME type</a> is <dfn export>supported by the user agent</dfn> if the user agent has the
capability to interpret a <a>resource</a> of that <a>MIME type</a> and present it to the user.

<p class=XXX>This needs more work. See
<p class=XXX>Ideally this would be more precise. See
<a href=https://github.com/w3c/preload/issues/113>w3c/preload #113</a>.

<div algorithm>
<p>To <dfn export>minimize a supported MIME type</dfn> given a <a>MIME type</a> <var>mimeType</var>,
run these steps. They return an <a>ASCII string</a>.

<ol>
<li><p>If <var>mimeType</var> is a <a>JavaScript MIME type</a>, then return
"<code>text/javascript</code>".

<li><p>If <var>mimeType</var> is a <a>JSON MIME type</a>, then return
"<code>application/json</code>".

<li><p>If <var>mimeType</var>'s <a for="MIME type">essence</a> is "<code>image/svg+xml</code>",
then return "<code>image/svg+xml</code>".
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<li><p>If <var>mimeType</var> is an <a>XML MIME type</a>, then return
"<code>application/xml</code>".

<li><p>If <var>mimeType</var> is <a>supported by the user agent</a>, then return
<var>mimeType</var>'s <a for="MIME type">essence</a>.

<li><p>Return the empty string.
</ol>

<p class=note>The goal of this algorithm is to allow the caller to distinguish MIME types with
different processing models, such as those for GIF and PNG, but otherwise provide as little
information as possible.
</div>


<h3 id=mime-type-writing>MIME type writing</h3>

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