Background.php

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<?php

class HTMLPurifier_AttrTransform_Background extends HTMLPurifier_AttrTransform {

    public function transform($attr, $config, $context) {

        if (!isset($attr['background'])) return $attr;

        $background = $this->confiscateAttr($attr, 'background');
        // some validation should happen here

        $this->prependCSS($attr, "background-image:url($background);");

        return $attr;

    }

}

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