reader view, navigation (TOC), "title"-only headings should not be clickable, should be inert.

[danielweck]

Links without destination hrefs are correctly rendered (visually differentiated), however they should also be totally inert. Right now, they respond to mouse hover, display a hand cursor which indicates clickability. Nothing happens when clicking. However, when using the keyboard the links can be activated and a web browser window is opened to load the external link!! (because of undefined value at the end ... not sure what it going on exactly, but it's a bug :)

Compare Thorium / readium-desktop with r2-testapp-js:

[danielweck]

Test file: moonstone.epub from https://1drv.ms/f/s!An5Z79wj5AZBgpFAxdv8z4Fo_z3ijw

See:
w3c/epub-specs#1283 (comment)

[danielweck]

Interestingly, good old Readium1 web/cloud reader renders the TOC with clickable and usable top-level chapter links:

[danielweck]

These ones are a variant with a different TOC:
http://www.feedbooks.com/book/3311/the-moonstone
https://www.gutenberg.org/ebooks/155
In this case, the headers are clickable and function as normal links (they should not be inert, because their href is valid)