Em vs rem and section vs div

#1

what is the difference between em vs rem and section vs div

#2

em is used to relative font size of parent element and rem is used in relative font sizing of HTML root tag.
In the HTML5 standard, the <section> element is defined as a block of related elements.
The <div> element is defined as a block of children elements.

#3

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#4

what are the related elements??

#5

Their parent or child elements for exaple in this:

> <div><h1>Hey</h1></div>
H1 is related to div and vice-versa

#6

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