HLS Video wrong playing in Safari mobile

Number:rdar://32197331 Date Originated:15.05.2017
Status:open Resolved:
Product:iPhone 5s Product Version:10.3.1
Classification: Reproducible:
While playing a HLS video in Safari browser, and move in the same tab to another site, continue to load TS files pre-open site.

Steps to Reproduce:
1. Open the Web page on which the player playing video (videojs player)(e.g. m.youtube.com)
2. Using a utility like watching mitmproxy loaded .m3u8 and .ts files during playback
3. Staying on this tab in Safari browser turn on any other web site
4. In program mitmproxy, when loading a new page, watching downloading video content from the previous site.

Expected Results:
The transition to a new website, download the content from the previous need to stop.

Actual Results:
When moving to another web page in the browser safari, staying in one tab from a previous video site continues to downloading


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