--TEST--
TokenList: supports
--EXTENSIONS--
dom
--FILE--
<?php

$dom = DOM\XMLDocument::createFromString('<root class="a b c"><child/></root>');
$element = $dom->documentElement;
try {
    $element->classList->supports('a');
} catch (TypeError $e) {
    echo $e->getMessage(), "\n";
}

?>
--EXPECT--
Attribute "class" does not define any supported tokens