Should DOM tokenizer fail at missing whitespace between attributes?

[NicTorgersen]

Description

The following code:

<?php

use Dom\HTMLDocument;

HTMLDocument::createFromString('<svg xmlns="http://www.w3.org/2000/svg"width="24"height="24"fill="none"viewBox="0 0 24 24" part="w-icon-circle-plus-24-part">')

Resulted in this output:

Dom\HTMLDocument::createFromString(): tokenizer error missing-whitespace-between-attributes in ...

I know it's not "correct" markup, but in Firefox this is correctly parsed and working. The error is thrown from php-src/ext/dom/lexbor/lexbor/html/tokenizer/state_doctype.c:184.

PHP Version

PHP 8.4.4

Operating System

MacOS Sequioa 15.3.1

[nielsdos]

It is correctly parsed though: https://3v4l.org/WRlGQ

From the HTML spec (CTRL-F for the error):

missing-whitespace-between-attributes

This error occurs if the parser encounters attributes that are not separated by ASCII whitespace (e.g., <div id="foo"class="bar">). In this case the parser behaves as if ASCII whitespace is present.

So the behaviour seems right to me.

[nielsdos]

It's not a hard error, it's a soft error, so tokenizing and parsing just continues.
In fact, Firefox reports the same errors. If you go to "view source" and hover over the underlined line you see that it also reports the errors that DOM reports

[NicTorgersen]

Okay, I guess this can be closed.