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改进 YouTube 剧场模式，参考 Twitch.tv 的设计，增强视频与聊天室布局，同时保持性能与兼容性，也达到了类似B站的网页全屏功能。同时新增可选的、自制风格的浮动聊天室功能（仅限全fullscreen模式），融入了 YouTube 原有的设计语言。
Thanks for the bug report, the issue should be fixed in the newest version (v2.2.1). The bug was only visible if the headmast is lowered from the advanced settings, hence why I didn't catch it.
The < symbol is actually a clickable button that hides/unhides the YouTube live chat. Please do give it a try if you ever need to close the chat sideways.
Fixed, good job.
Thank you.
There may be a minor bug, there is a “<” icon in regular videos, not livestreams.
