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A reliable function to insert float buttons in web page
Insert a floating button in the web page (for developers only).
Follow Material Design, beautiful and practical.
Use Shadow Dom, ensure that the float button style does not conflict with the global style.
When the code is run multiple times (multiple UserJS uses this code), only one button container will be created (avoid conflicts).
Click the dot in the upper left corner to toggle the button to hide/show to avoid obscuring the page content.