What is speculative parsing?

Question

I\'ve read that Firefox 3.5 has a new feature in its parser ?

Improvements to the Gecko layout engine, including speculative parsing for faster conten

Answer 1

I think it means that when the browser would normally block (for example for a script tag), it will continue to parse the HTML. It will not create an actual DOM until the missing pieces are loaded, but it will start fetching script files and stylesheets in the background.