\Dom\ParentNode::querySelector and \Dom\ParentNode::querySelectorAll requires elements in $selectors to be lowercase #20395
Description
Description
(Related: #17802 - in this issue there was a very similar issue, where if attribute names in $selectors didn't match the case of the attribute then the node was not matched.)
The following code:
<?php
$html = "<!doctype html><html><head></head><body></body></html>";
$dom = \Dom\HtmlDocument::createFromString($html);
var_dump(\is_null($dom->querySelector("html")));
var_dump(\is_null($dom->querySelector("Html")));
var_dump(\is_null($dom->querySelector("HTML")));Resulted in this output:
bool(false)
bool(true)
bool(true)
But I expected this output instead:
bool(false)
bool(false)
bool(false)
PHP Version
All PHP8.4 versions and git.master (2025-09-27)
Operating System
No response