Lazyload::parseImgTag

protected function parseImgTag(DOMElement $node, string $selector): void
{
	$origSrc = $node->getAttribute('src');
	if (!$origSrc)
	{
		return;
	}

	// get sizes for placeholder
	if (
		($fileId = $node->getAttribute('data-fileid'))
		&& $fileId > 0
		&& ($fileArray = File::getFileArray($fileId))
	)
	{
		$width = $fileArray['WIDTH'];
		$height = $fileArray['HEIGHT'];
	}
	else if ($manifestSize = $this->getPlaceholderSizeFromManifest($selector))
	{
		[$width, $height] = $manifestSize;
	}
	else
	{
		$width = $height = self::IMG_PLACEHOLDER_SIZE_DEFAULT;
	}

	$lazySrc = $this->createPlaceholderImage($width, $height);

	$node->setAttribute('data-lazy-img', 'Y');
	$node->setAttribute('data-src', $origSrc);
	$node->setAttribute('src', $lazySrc);
	$node->setAttribute('loading', 'lazy');    //for native
	if ($srcset = $node->getAttribute('srcset'))
	{
		$node->removeAttribute('srcset');
		$node->setAttribute('data-srcset', $srcset);
	}
}