is there a list of default values of css properties ? (so I can make an exclusion array in js for them)

Question

All sites that list css properties such like MDN or w3schools list every CSS property on separate pages.

When I\'m iterating over CSSStyleDeclaration I get

Answer 1

The specifications define initial values, i.e. the values to be used in the absence of any stylesheet or equivalent. The default values, in the sense of values used in the absence of any author stylesheet (= page stylesheet), are implementation-dependent. They depend on browsers (conceptually, on browser default stylesheets) and on their settings (user stylesheets or browser settings).

Finding out the initial values is just raw work, but you shouldn’t expect them to be default values. There doesn’t seem to be any way to programmatically find out the default values. For a specific browser, you might be able to locate its default stylesheet or its description, but they would tell you just the “factory defaults.”