- From: C. Scott Ananian <notifications@github.com>
- Date: Mon, 19 May 2025 13:34:41 -0700
- To: whatwg/dom <dom@noreply.github.com>
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- Message-ID: <whatwg/dom/issues/1373/2892200952@github.com>
cscott left a comment (whatwg/dom#1373)
I can confirm that the existing html5lib tests contain a number of "illegal" doctypes of this sort which pass the HTML parser, like `<!DOCTYPE ...>` in https://github.com/html5lib/html5lib-tests/blob/master/tree-construction/doctype01.dat#L348. So I'd also be in favor of making the doctype consistent.
Processing instructions I don't care as much about, since those are more relevant to XHTML serializations. https://developer.mozilla.org/en-US/docs/Web/API/ProcessingInstruction says "Warning: ProcessingInstruction nodes are only supported in XML documents, not in HTML documents. In these, a process instruction will be considered as a comment and be represented as a Comment object in the tree." This isn't actually reflected in the DOM spec for (eg) https://dom.spec.whatwg.org/#ref-for-dom-document-createprocessinginstruction%E2%91%A0. But on Chrome at least:
```
doc = (new DOMParser()).parseFromString("<?xml-stylesheet href=\"mycss.css\"?>", "text/html");
new XMLSerializer().serializeToString(doc);
```
returns
```
<!--?xml-stylesheet href="mycss.css"?--><html xmlns="http://www.w3.org/1999/xhtml"><head></head><body></body></html>'
```
so in a purely pedantic sense there is no need for `document.createProcessingInstruction` to be able to create processing instructions *at all* in order to allow DOM methods to be used to parse *HTML* because when parsing *HTML* we are using `document.createComment` to create the nodes for this construction.
tl;dr I think it's fine for document.createProcessingInstruction to be XML only and as such maintain the XML name rules. But `createDocumentType` is used for HTML parsing and as such should allow the HTML character set.
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Received on Monday, 19 May 2025 20:34:45 UTC