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Ensure empty inline svg and math tags are serialized as void tags #259

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Merged
goetas merged 1 commit into from
Jul 25, 2025
Merged

Ensure empty inline svg and math tags are serialized as void tags #259

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8 changes: 7 additions & 1 deletion src/HTML5/Serializer/OutputRules.php
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Original file line number Diff line number Diff line change
Expand Up @@ -206,6 +206,9 @@ protected function doctype()
$this->nl();
}

/**
* @param \DOMElement $ele
*/
public function element($ele)
{
$name = $ele->tagName;
Expand All @@ -227,6 +230,9 @@ public function element($ele)
}

$this->openTag($ele);
// The tag is already self-closed (`<svg />` or `<math />`) in `openTag` if there are no child nodes.
$handledAsVoidTag = $this->outputMode !== static::IM_IN_HTML && !$ele->hasChildNodes();

if (Elements::isA($name, Elements::TEXT_RAW)) {
foreach ($ele->childNodes as $child) {
if ($child instanceof \DOMCharacterData) {
Expand All @@ -248,7 +254,7 @@ public function element($ele)
}

// If not unary, add a closing tag.
if (!Elements::isA($name, Elements::VOID_TAG)) {
if (!$handledAsVoidTag && !Elements::isA($name, Elements::VOID_TAG)) {
$this->closeTag($ele);
}
}
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17 changes: 17 additions & 0 deletions test/HTML5/Serializer/OutputRulesTest.php
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Expand Up @@ -652,4 +652,21 @@ public function testHandlingInvalidRawContent()
<h1>Hello!</h1>
<p>Bar</p></script>'));
}

public function testSvgAndMathElementsWithoutChildNodesAreHandledAsVoidTags()
{
$dom = $this->html5->loadHTML(
'<!doctype html>
<html lang="en" id="base">
<body>
<svg></svg>
<math></math>
</body>
</html>');

$contents = $this->html5->saveHTML($dom);

self::assertRegExp('|^\h*<svg />$|m', $contents);
self::assertRegExp('|^\h*<math />$|m', $contents);
}
}