clearMatch() method of the HTMLIFrameElement clears any content highlighted by findAll() or findNext().findAll() method of the HTMLIFrameElement searches for a string in a browser <iframe>'s text content; if found, the first instance of the string relative to the caret position will be highlighted.findNext() method of the HTMLIFrameElement highlights the next or previous instance of a search result after a findAll() search has been carried out.