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

@annevk 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>.

Clearly we need more testing. Currently `data:text/xml,<?xml-STYLESHEET href="data:text/css,test{background:lime}"?><test/>` is not green in browsers. But `data:text/xml,<?xml-stylesheet href="data:text/css,test{background:lime}"?><test/>` is.

Similarly, `data:text/xml,<?xml-stylesheet HREF="data:text/css,test{background:lime}"?><test/>` is not green.

So I think case-sensitive and case-sensitive comparisons are the way to go, except perhaps for `<?xml` if tests prove otherwise there.

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