• Fix time slider crash on left/right arrow keypress #2622
• Fix bug before media loads and currentTime is not a number #2658
  (IE 11, IndexSizeError or InvalidStateError returned in the console when seek asked before play)
• progress.js: Put brackets around nested conditions to comply with Old browsers
• Html validation issue and patch (put 0 instead of NaN as a value for aria-maxvalue)
  Until 'play' is clicked the value is 0, formerly 'NaN'.
  While playing media the value is the currentTime
• No longer modify any objects under the global window objects to prevent side effect. (PR #2123 Fixed #2598)
• Added handling of the .play() promise errors to native_hls player (PR#2550)