Disable autoplay

[jonathansampson]

Test plan

A.

1. Go to https://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_video_autoplay
2. Video should not autoplay
3. Click bravey panel to allow autoplay
4. Video should autoplay

B.

1. Go to youtube and watch a video
2. Video should not autoplay
3. Click bravey panel to allow autoplay
4. Video should autoplay

C. Also covered by automatic test

---

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

Test Plan:

Resolves #7663
Resolves #2227
Resolves #4045

[darkdh]

There should be a global default setting of autoplay preference.

[jonathansampson]

@darkdh You mean, a switch inside about:preferences#shields?

[darkdh]

yeah, we should let users choose control the default global setting of it

[bridiver]

can we add tests for this? Preferably using a localhost url and not a remote site
otherwise ++

[jonathansampson]

@darkdh Global setting is now set.
@bridiver Working on test(s) next.

[jonathansampson]

@bridiver Spectron tests aren't running on Windows. I'm going to try and get it working on my Ubuntu VM, but it could be a day or two. Would you be okay with us merging prior to landing tests?

[darkdh]

I can help adding the test from Mac

[jonathansampson]

@darkdh That would be awesome! Thanks 🙂

[gary-schiltz]

I would also like to see the ability to control the preloading of HTML5 videos, since it consumes bandwidth, even if the user has no intention of watching a video. The desired behavior would be for the browser to act as if the preload attribute of all tags were set to "none" or perhaps "metadata". The test for this would be to clear the browser's cache, visit https://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_video_preload, and watch some type of bandwidth indicator.