Re: [whatwg/dom] Define processing instruction attributes (PR #1454)

@foolip commented on this pull request.



> +   <li><p>Append <var>value</var> to <var>data</var>.
+
+   <li><p>Append U+0022 (") to <var>data</var>.
+  </ol>
+
+ <li><p><a>Replace data</a> of <var>pi</var> with 0, <var>pi</var>'s <a for=Node>length</a>,
+ <var>data</var>, and true.
+</ol>
+</div>
+
+<div algorithm>
+<p>To <dfn export id=concept-pi-get-attribute>get a processing instruction attribute</dfn>, given a
+{{ProcessingInstruction}} <a for=/>node</a> <var>pi</var> and a string <var>name</var>:
+
+<ol>
+ <li><p>Let <var>lowercaseName</var> be <var>name</var> in <a>ASCII lowercase</a>.

We don't have to, but lowercasing in HTML nicely handles the "xml" target in any case, aligning with https://www.w3.org/TR/xml/#dt-pi.

But we could preserve case and do case-insensitive comparisons for "xml" and "xml-stylesheet". Would you prefer that?

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