[IDEA] Apply :where() on all of the tiddlywiki styles to ensure the lowest specifity possible / avoid clash with user customisation

[Telumire]

The :where() pseudo-class is used in https://open-props.style/ , a CSS framework created by Adam Argyle. In this video, he explain why this is useful: https://youtube.com/clip/UgkxF9g6_f5DbO4jP26dUpN9gqpHzCS3XYqN?si=ktxEvM0ZEhBfisEc

In summary, this gives the selectors a specificity of 0; which means that they can be overridden very easily. Currently, caniuse indicate a global usage of 93.34%. The MDN doc mark this feature as "Baseline - Widely available : This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2021".

Is this support sufficient or should we wait a few years before using this feature ?