Is there an impact on user experience when CSS code is separated into multiple declarations?
I've come across .css files that are organized like the following:
/* Font Styles */
#text{ font-size: 12px; color: white;}
.highlight{ color: red}
/* END */
/* Div Positioning */
#text{ position: absolute;}
/* END */
Could this potentially lead to inefficiencies? While it may not be noticeable on a small scale, what about on large style sheets?
It is commonly believed that having more rules leads to increased overhead. Yet, CSS parsing tends to be quite rapid, so there's no need to fret unless your style sheets are exceptionally massive.
While it is possible for CSS to impact performance, this typically only occurs when dealing with a large number of selectors. For further information on this topic, be sure to check out the following article: http://www.example.com/impact-of-css-on-performance
In my opinion, the answer would technically have to be affirmative.
The browser is required to interpret the updated rule, search for the #text element once more in the DOM, and execute any additional layout/rendering calculations.
However, as you rightly mention, it is best to wait until this becomes an issue before attempting any optimizations.
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