Fixes bug #2004.
Refactored the communication between the speaker notes window and the
regular window by using a Broadcast channel - this is now
self-recovering(!) even if speaker notes are closed and manually
re-opened!
For better readability and maintainability refactored some string-based
states into enum style code and refactored detection of the type of
windows (print, speaker note, regular window)
Manually tested the new code and the speaker notes window does not
disconnect from the regular window anymore.
This now works way more reliable, even if there are (still) some UI
glitches that have been there before already.
Change this selector to use the ~= selector to test if a white space
separated word "prev" or "next" is contained
Fixes a speaker notes bug that did not allow going to the next slide in
the speaker notes.
The reason for that is that the "rel" attribute contained "prev"
respective "next prefetch".
See:
https://developer.mozilla.org/en-US/docs/Web/CSS/Attribute_selectors#attrvalue_2
This fixes part of #2004 when going to the right (containing
"prefetch").
* Add chrome.css and general.css to override default css file. This is
necessary to fix links without underline (hyperlinks relying only on
color).
* Fix pop-out button without id and wrong ARIA-ROLE
* Speaker's notes now at correct heading sequence (H3)
Initially, I also formatted the templates in `theme/`, but this triggers
https://github.com/prettier/prettier/issues/11834. So I exclude them for
now.
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Co-authored-by: Ming-Ying Chung <mych@chromium.org>
