Add controlslist attribute

[nkr0]

https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/controlsList

[12rambau]

Usually, Sphinx list parameter are set as comma separated values in Sphinx directives, can you adpt your code to fit this unwritten and undocumented standard ? 😄

[12rambau]

@nkr0 you now need to remove the bad value example from the documentation as it's raising an error. And catch it in the tests as it will raise an error as well.

[nkr0]

@nkr0 you now need to remove the bad value example from the documentation as it's raising an error. And catch it in the tests as it will raise an error as well.

It feels a bit odd that an error in one rst file can cause all the other tests in that directory to fail as well. Seems like sphinx reads every file in a directory even after changing from build_all to build_specific.