Default background color of SVG root element

Question

I\'d like to set a default background color for the entire SVG document, to red for example.

Answer 1

It is the answer of @Robert Longson, now with code (there was originally no code, it was added later):

This answer uses:

• https://stackoverflow.com/a/11293812/6747994
• https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorial/Fills_and_Strokes