What does !important mean in CSS? Is it available in CSS 2? CSS 3?

Understanding the Context

Where is it supported? All modern browsers? Using the !important keyword in CSS is a way to prevent other meddlesome programs from taking liberties to interpret your html/css in a way other than what you want. For example when someone goes to print your html/css to paper-and-ink, they often want the background-color property to be white to save ink.

Key Insights

So the program overrides your background-color property. This !important keyword ... The use of !important is very import in email creation when inline CSS is the correct answer. It is used in conjunction with @media to change the layout when viewing on different platforms. It's almost never a good idea to use !important.

Final Thoughts

This is bad engineering by the creators of the WordPress template. In viral fashion, it forces users of the template to add their own !important modifiers to override it, and it limits the options for overriding it via JavaScript. But, it's useful to know how to override it, if you sometimes have to. $("#elem").css("width", "100px !important"); This does nothing; no width style whatsoever is applied. Is there a jQuery-ish way of applying such a style without having to overwrite cssText (which would mean I’d need to parse it first, etc.)? Edit: I should add that I have a stylesheet with an !important style that I am trying to override with an !important style inline, so using .width() and ...

In general, it is possible to override a declaration that has !important by using a rule that also has it and that has higher specificity. However, a declaration in a style attribute has, by definition, higher specificity than any other author declaration. Gmail uses several signals to decide which messages to automatically mark as important, including: Whom you email, and how often you email them Which emails you open Which emails you reply to Keywords that are in emails you usually read Which emails you star, archive, or delete To see why an email was marked as important, hover over the importance marker . Material UI and TypeScript: How to use !important?