[KevinH]

The Sigil version should be nearly identical to the Chrome browser version (but it might be a few versions behind) for the most part. The network stuff is really only useful for epub3 remote resources, just like the javascript console is really only useful for epub3s that use javascript.

Yes a basic description of what a DOM tree is (a tree based parsing of their xhtml code in CodeView) would help but showing how to click on the tree to expand and collapse it to find the tags (nodes) of interest and where to look (for the selected tag) for the layout details height/width and where that tag/node inherits its css definitions from (especially important for cascading part of css) are probably the most important parts for most epub developers.

Then pointing people with external links for all of the rest of it in case they are interested.

That would be grand!