Sample code to demonstrate the issue with wp_kses and allowed_html for sanitizing svg's that contain attributes with numbers at the end

kses.php

<?php
/**
 * Sample code to demonstrate the issue with wp_kses and allowed_html for sanitizing svg's that contain attributes with numbers at the end.
 */

$svg = <<<SVG
<svg>
	<path x1="10" y1="10"/>
</svg>
SVG;

$allowed_html = [
	'svg'  => [],
	'path' => [
		'x1',
		'y1',
	],
];

$sanitized_svg = wp_kses( $svg, $allowed_html );
echo $sanitized_svg; // Both x1 and y1 attributes of the `path` tag will be stripped.

if ( $svg !== $sanitized_svg ) {
	echo 'The wp_kses function removes any attributes that have numbers at the end.';
} else {
	echo 'Everything works as expected.';
}