WPF WebBrowser控件不会在本地托管的HTML页面中加载视频

I have a WPF application written in C#. This application has two WPF WebBrowser controls next to each other. Each one navigates to a different locally-hosted HTML file. Each HTML file has a video element which points to an .mp4 video file stored in the same directory.I have a WPF application written in C#. This ap