Given two DIVs, A and B, where A contains B, and the following CSS styles:
A { margin-left: -2000px; }
B { margin-left: 2000px; }
With these CSS styles applied, the position of B remains unchanged compared to its original position without any CSS. I am curious to know if there will be a decrease in performance during rendering with this CSS as opposed to having no CSS at all.
By unnecessarily burdening the browser with CSS calculations, you're causing a slight decrease in performance, albeit infinitesimally small. :)
The average user is unlikely to ever notice this inefficiency!
To draw a comparison with coding, it's more efficient to declare a variable like this:
var a = 0;
rather than using:
var a = 1 - 1;
In reality, very few people (outside of developers) would ever perceive the difference, although fellow coders might raise an eyebrow at your unconventional approach in the code.
Nope, definitely not. If such a thing existed, you would only be communicating for 0.001 seconds.
In the scenario where conflicting options are assigned to the same object, the final choice takes precedence.
Given the average speed of internet connections, you likely don't need to stress too much. Unless your Stylesheet is excessively lengthy, it could be beneficial to run it through a Optimization tool, but overall, there's probably no need for major concern.
My observation has been that the performance takes a hit only in cases where elements are styled with position:fixed (meaning they remain fixed while you scroll)... In these instances, I've noticed Firefox can become slightly choppy during scrolling.
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