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When using selectors in CSS and in jQuery, are there any efficiency differences between using'E#id' and #id, where E is any HTML element? If yes, does it only apply to certain layout engines and/or Javascript engines?
Browsers read the selectors right to left so there is little to be gained by prefixing anything before the id; it is redundant at that point. Source:
Writing Efficient CSS from Mozilla
Here’s a real world example to test it for yourself. TL:DR; it doesn’t seem to matter enough to make a difference.
Relevant further reading from a previous Stack Overflow question