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

@noamr commented on this pull request.



> +
+<div algorithm>
+<p>The <dfn method for=ProcessingInstruction><code>hasAttribute(<var>name</var>)</code></dfn>
+method steps are:
+
+<ol>
+ <li><p>If <a>this</a>'s <a for=Node>node document</a> is an <a>HTML document</a>, then set
+ <var>name</var> to <var>name</var> in <a>ASCII lowercase</a>.
+
+ <li><p>Return true if <a>this</a>'s <a for=ProcessingInstruction>attribute map</a>[<var>name</var>]
+ <a for=set>exists</a>; otherwise false.
+</ol>
+</div>
+
+<div algorithm>
+<p>To <dfn>update attributes from data</dfn> for a {{ProcessingInstruction}} <a for=/>node</a> <var>pi</var>:

The main difference is what happens if `pi.data` is set after the PI is moved to an HTML document (or constructed with `createProcessingInstruction`). In the new scenario invalid XML yet valid HTML can be used in that `data` for the `xml-stylesheet` attributes.

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