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Fixed wrong focus on load when using default subtitles @dpxgit in https://github.com/mediaelement/mediaelement/pull/2958

• Fixed wrong focus on load when using default subtitles(#2957) @Necxes
• Improved performance by eliminating a test logic event ([#2954]) @westonruter

• HLS and MPEG-Dash renderer should now have working captions, when loaded initially. @dpxgit in https://github.com/mediaelement/mediaelement/pull/2947
• Updated demo/index.html for easier debugging. @dpxgit in https://github.com/mediaelement/mediaelement/pull/2947

• Fixed an error that occurred with the iFrame players
• Fixed a problem with the scaling of iFrames within their containers

Fix state of caption toggle not visible

Removal of flash support

• Flash support removed, see Migration Guide for more information about breaking changes. Thanks to @jaapmarcus for initial PR.
• Make test npm-script available to work on all plattforms.
• HLS and MPEG-Dash renderer should now have working captions. (#2928)
• Fix firefox bug on mouseout. (#2840) Thanks to @JoshStegmaier.

Replaced outline-style: auto with outline-style: solid to enable Firefox to show the correct outline-color if defined.

Added outline-style to enable Firefox to show the correct outline-color if defined.

• Fixed an error that prevented some mobile devices from reliably selecting chapters and subtitles

Support for native VTT-Subtitles

• Fix missing video tracks after player is removed
• Added browser-native subtitle support and removed custom VTT/DFXP parsing
• Removed support for "slides" tracks which were non-functional
• Removed options: "tracksAriaLive", "captionTextPreprocessor", "slidesSelector"
• Renamed "startLanguage" option to "autoplayCaptionLanguage" for clarity
• New option "chaptersLanguage" to set the language of the displayed chapters track.
• new option "defaultTrackLine" to control in which line subtitles are displayed by default
• Fixed being able to activate disabled caption-buttons
• Fixed "default" track not automatically playing (subtitles and captions tracks only)