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Re:Kosmonaut: web browser from scratch in Rust by userbinator on Saturday August 15, 2020 @06:03PM (#24172813)
Some browsers have (had) user stylesheets, which can do exactly that.

Firefox (barely) still has that option but it's disabled by default, Chrome had removed it many version ago, and Edge never had it from the beginning. IE11 still has the option.

Re:Kosmonaut: web browser from scratch in Rust by zzo38computer on Saturday August 15, 2020 @07:59PM (#24173532)
I think it may be helpful to have some privileged commands which are only allowed in user stylesheets.

(Additional unprivileged commands may also be useful, such as ability to specify colours by index number, and ability to specify the names of user configuration values where other values are expected.)