2.2.21 [HTML5:2014] Section 4.7.10.13 User interface

C0035: The volume level and mute setting are not retained between navigations

The specification states:

 ... User interface
     ...
     The volume attribute must return the playback volume of any audio portions of the 
     media element, in the range 0.0 (silent) to 1.0 (loudest). Initially, the volume 
     should be 1.0, but user agents may remember the last set value across sessions, on a 
     per-site basis or otherwise, so the volume may start at other values. ...
  
     The muted attribute must return true if the audio output is muted and false 
     otherwise. Initially, the audio output should not be muted (false), but user agents 
     may remember the last set value across sessions, on a per-site basis or otherwise, so 
     the muted state may start as muted (true). ...

All document modes (All versions)

The volume level and mute setting are not retained between navigations.

C0034: Controls are not provided if the controls attribute is absent

The specification states:

 ... User interface
     ...
     ... may provide controls to affect playback of the media resource ..., but such 
     features should not interfere with the page's normal rendering. ...

All document modes (All versions)

Controls are not provided if the controls attribute is absent.