The idea is to quickly text CSS selectors/XPath in a document to see what will match, or how many instances of a certain element there are (thinking certain type of heading, for instance).
It offers:
- A quick way to filter HTML elements via CSS selector(s) or XPath
- Highlight them in the document
- List them in the Firebug panel in a collapsable list
- A count of the total matching number of elements
https://addons.mozilla.org/en-US/firefox/addon/11905
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