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I tried to inject a style using this code:
document.body.style.color='green!important'; Per the CSS cascade ref, by applying the !important rule I can trump origin and specificity.
I tried to inject this using Firefox Firebug into www.google.com however no luck.
How do I inject a foreground color with an !important rule?
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JavaScript can change Css styles such as color, font size etc. of elements using some methods such as getElementById(), getElementByClassName() etc. In the following example font style and font size of the elements have changed using getElementById() method.
Per the spec, if you want to set the priority, not just the value, you have to use setProperty, like so:
document.body.style.setProperty ("color", "green", "important"); 
element.style.cssText = 'color:green !important'; should work for you.
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