Closed
Description
Symfony version(s) affected: 4.3.4
Description
The XPath expression returned by, e.g., CssSelectorConverter::toXPath("span:only-of-type") is descendant-or-self::span[last() = 1]. This will only match a <span> element if it is the only one in the entire HTML (not just among its siblings).
How to reproduce
$converter = new \Symfony\Component\CssSelector\CssSelectorConverter();
$xPathExpression = $converter->toXPath("span:only-of-type");
$domXPath = new \DOMXPath($domDocument);
$nodeList = $domXPath->query($xPathExpression);where $domDocument is a \DOMDocument containing the following HTML:
<html>
<body>
<p>
<span></span>
</p>
<p>
<span></span>
<span></span>
</p>
</body>
</html>$nodeList will be empty but should contain the <span> from the first paragraph. If the second paragraph is removed, the behaviour is as expected ($nodeList will contain the <span> from the first paragraph), becuase there is only one <span> element in the entire document.