Invalid ID attribute with php8.4's \Dom\HTMLDocument #18316
Description
Description
The following code:
<?php
$html = `<p id="example ">`
$dom = \Dom\HTMLDocument::createFromString($html, LIBXML_NOERROR, "UTF-8");
echo $dom->saveHTML();Resulted in this output:
<html><head></head><body><p id="example "></p></body></html>But I expected this output instead:
<html><head></head><body><p id="example"></p></body></html>As per https://html.spec.whatwg.org/multipage/dom.html#global-attributes:the-id-attribute-2
When specified on HTML elements, the id attribute value must be unique amongst all the IDs in the element's tree and must contain at least one character. The value must not contain any ASCII whitespace.
Further detail at https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Global_attributes/id#syntax
I'd suggest trimming whitespace from the IDs. It may also be sensible to do that on the other attributes. Of course, the behaviour does depend on how closely you want to follow the input's mistakes. If the intention is to closely replicate the input (whether their original code was valid or not) then please close this bug.
PHP Version
PHP 8.4.6 (cli) (built: Apr 11 2025 02:19:14) (NTS)
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