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Dom\HTMLDocument parser mangles xml:space and xml:lang attributes #21486
Description
Description
The following code:
<?php
$d = @\Dom\HTMLDocument::createFromString("<div></div>");
$e = $d->getElementsByTagName("div")[0];
$e->innerHTML = '<svg xml:space="default" xlink:href="about:blank" xmlns:foo="barspace"></svg>';
$svg = $d->querySelector("svg");
echo $e->innerHTML."\n";
echo $svg->attributes[0]->localName." ".var_export($svg->attributes[0]->namespaceURI, true)."\n";Resulted in this output:
<svg space="default" xlink:href="about:blank" xmlns:foo="barspace"></svg>
space NULL
But I expected this output instead:
<svg xml:space="default" xlink:href="about:blank" xmlns:foo="barspace"></svg>
space 'http://www.w3.org/XML/1998/namespace'
Note this case is covered by the test suite here:
https://github.com/html5lib/html5lib-tests/blob/8f43b7ec8c9d02179f5f38e0ea08cb5000fb9c9e/tree-construction/webkit02.dat#L363
PHP Version
PHP 8.5.4 (cli) (built: Mar 11 2026 12:09:53) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.5.4, Copyright (c) Zend Technologies
with Zend OPcache v8.5.4, Copyright (c), by Zend Technologies
Operating System
Arch Linux
Activity
[-]Dom\HTMLDocument parser mangles xml:space attribute[/-][+]Dom\HTMLDocument parser mangles xml:space and xml:lang attributes[/+]Oleh8978 commentedon Mar 21, 2026
Reproduced on PHP 8.5.3 (CLI) built via Homebrew on macOS.
Output:
space NULL
Expected xml namespace to be preserved (xml:space with proper namespace URI).
Oleh8978 commentedon Mar 21, 2026
Reproduced on PHP 8.5.3 (CLI, Homebrew, macOS).
HTML parsing (Dom\HTMLDocument):
space NULL
XML parsing (DOMDocument::loadXML):
xml:space
http://www.w3.org/XML/1998/namespace
This suggests the issue is specific to Dom\HTMLDocument (HTML parsing), where the xml namespace prefix is dropped and namespaceURI is lost.
Fix phpGH-21486: Dom\HTMLDocument parser mangles xml:space and xml:la…
Fix GH-21486: Dom\HTMLDocument parser mangles xml:space and xml:lang …
Merge branch 'PHP-8.4' into PHP-8.5
Merge branch 'PHP-8.5'