protected function convertPercentageDimensions(Node $node)
{
$parentWidth = $node->getParent() ? $node->getParent()->getWidthWithoutPaddings() : null;
$parentHeight = $node->getParent() ? $node->getParent()->getHeightWithoutPaddings() : null;
$node->convertScalarAttribute('width', $parentWidth);
$node->convertScalarAttribute('height', $parentHeight);
$node->convertScalarAttribute('max-width', $parentWidth);
$node->convertScalarAttribute('max-height', $parentHeight);
}
