mozilla/pdf.js — pull request #2002 by yurydelendik (2012-08-20 01:07:25+00:00)
Title: Adds textlayer debug modes

(instead of `#disableTextLayer=true`) the following options can be used:
`#textLayer=off` - turns of the textLayer;
`#textLayer=visible` - makes text layer visible;
`#textLayer=shadow` - makes text layer visible (original text semi-visible);
`#textLayer=hover` - text layer portion/div visible on hover.