hints don't show on some pages

[The-Compiler]

• https://relayrides.com/search?location=ZIPCODE&startDate=&endDate=#location=ZIPCODE&page=1 (dropdowns)
• http://buildbot.net/ (the "fork me on github!" banner)
• GMail tabs:

• Facebook input fields with ;t (2025: unverified)
• "Keep me signed in" checkbox on https://www.messenger.com/
• learnopengl.com menu items (Not all hints shown on certain websites #6864)
• DuckDuckGo thems in settings (qutebrowser's hint mode doesn't show all clickable parts in a website #7738)
• "Safe search" drop-down menu on DuckDuckGo (f not detecting clickable elements #8543)

Pages which seem to work in the meantime:

• mobile.de: this page. - It seems they wrap all <a>-tags in <div> tags and that maybe trips hint searching up.
• http://codecore.ca/
• Google searches (the "gle"/next link - the hint at the top left of that is for page 10)
• Searx category headers (There is no hint for searx search categories. #6694)
• Google+, reported by V155 on IRC (outdated)
• Items at https://www.uni-bonn.de/studium/im-studium/studienorganisation/termine-und-fristen#einschreibefristen (<span> elements with JS click handlers)
• "Neueste zuerst" at https://www.ebay-kleinanzeigen.de/s-test-/k0 (<div> element with JS click handler)
• Twitter's "what's happening" box (div with role=textbox)
• Contacts on WhatsApp web (except for the pictures):
  
• Article links on tagesschau.de (Articles on tagesschau.de don't get hints #4988)

[B0073D]

'Mark as Read' button in IRCCloud. This button appears once you have been away from the channel for a while and there has been a fair amount of activity.

[NoSuck]

Add to this list: Gmail links to messages (the subject line) in HTML mode.

[error800]

Test case for the buildbot.net "fork me on github" banner.
The hint is actually there, but moved out of the visible screen by CSS:

<a style="position: relative; left: -1em;" href="http://qutebrowser.org">
  link link link
</a>

[error800]

The relayrides.com dropdown does not work because there is no link at all, there is just a <span> that gets a click event attached by JS.

[NoSuck]

Is issue #292 a duplicate of this one?

Another for the ongoing list: The Arch Mirror Status page has sortable headings (Mirror URL, Protocol, Country...) that do not get link hints.