4.2.2 Dealing with missing information

Occasionally there is no "href" URL provided in an <a> tag. In this case "unknown/nonexistent-url" is inserted into the page. This also happens for frames that have no "src" set - the text "nonexistent-frame" is shown. Set ‘wwe-render-nonexistent-url’ and ‘wwe-render-nonexistent-frame’, respectively, if you’d like to show something else, or "" to show nothing.