getElementsByTagName() equivalent for textNodes

Question

Is there any way to get the collection of all textNode objects within a document?

getElementsByTagName() works great for Elements, but

Answer 1

I know you specifically asked for a collection, but if you just meant that informally and didn't care if they were all joined together into one big string, you can use:

var allTextAsString = document.documentElement.textContent || document.documentElement.innerText;

...with the first item being the DOM3 standard approach. Note however that innerText appears to exclude script or style tag contents in implementations that support it (at least IE and Chrome) while textContent includes them (in Firefox and Chrome).