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I know it is possible to add new CSS classes definitions at runtime through JavaScript. But…
How to change/remove CSS classes definitions at runtime?
For instance, supose a I have the class below:
<style> .menu { font-size: 12px; } </style> What I want is, at runtime, change the font-size rule of the .menu class, so that every element in the page who uses this class will be affected.
And, I also want to know how to remove the .menu class definition.
It’s not difficult to change CSS rules at runtime, but apparently it is difficult to find the rule you want. PPK has a quick tour of this on quirksmode.org.
You’ll want to use
document.styleSheets[i].cssRuleswhich is an array you need to parse through to find the one you want, and thenrule.style.setProperty('font-size','10px',null);