Methods and apparatus, including computer program products, implementing and using techniques for searching for a string of characters on a web page. A user input is received containing a text search string to be identified on a web page loaded in a web browser on a computer. A common substring between the text search string and a hypertext markup language representation of the web page is determined. A document object model tree node that includes the common substring is identified. It is verified a remainder of the text search string is included in one or more surrounding nodes of the document object model tree.