4 * Pre-transform that changes proprietary background attribute to CSS.
6 class HTMLPurifier_AttrTransform_Background extends HTMLPurifier_AttrTransform {
8 public function transform($attr, $config, $context) {
10 if (!isset($attr['background'])) return $attr;
12 $background = $this->confiscateAttr($attr, 'background');
13 // some validation should happen here
15 $this->prependCSS($attr, "background-image:url($background);");