I wish that I could use Brave for testing for web development but your browser is broken.
It is important to be able to test html files in a browser without a server at the file:// level but you disable important things such as this
Which all browsers except for Brave fully support at file://
It is important for developers to be able to use pages which include html elements from other pages. Usually this is done with SSI on a server but many of us need to test our pages and do our dev on a local computer without a server and later upload our work to the server. The ability to use Javascript for a serverless alternative to SSI is priceless.
And your browser does not support this.
Change your policy.