Suboptimal recommendations for CSS selectors

I have a couple of questions regarding optimizing our outdated CSS for better performance.

(1) I am concerned about the impact on browser rendering performance due to including printer-related CSS in a common.css file and applying the selectors to certain elements. Does this affect how browsers match elements with the selectors beyond just when printing a page?

@media print
{
    body * {visibility:hidden}
    #xView, #xView * {visibility:visible; }
    #xView {position:fixed;}
}

(2) How can I assess the performance improvements after refactoring the CSS?

Thank you.

htmlcssbrowsercss-selectors

Answer №1

This snippet of code may not be very large, but discussing performance is still relevant. Using the "*" selector may not be the most efficient way to handle visibility. It would be more optimal to set visibility on one container rather than every element within it.

For further insight on performance testing, I recommend checking out:

You can also test page load times using Firebug, although the accuracy of the results may vary.

Answer №2

1: Negative, the print CSS is solely activated during printing, hence no validation against any code contained within it occurs prior to printing.

2: To gauge CSS performance, check out this CSS testing tool.

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