css - When should i use Absolute and Relative positioning? -


this question has answer here:

i have read absolute , relative positioning still haven't understand properly. what's practical use of absolute , relative positioning , when should use them exactly?

absolute: element positioned relative first positioned (not static) ancestor element

relative: element positioned relative normal position

this tells browser whatever going positioned should removed normal flow of document , placed in exact location on page. taken out of normal flow of document - won't affect how elements before or after in html positioned on web page.

if want position element 10ems top of document window, use "top" offset position there absolute positioning:

 position: absolute;  top: 10em;

this element display 10em top of page - no matter else displays there in normal flow.

relative positioning uses same 4 positioning properties absolute positioning. instead of basing position of element upon browser view port, starts element if still in normal flow.

for example, if have 3 paragraphs on web page, , third has position: relative style placed on it, it's position offset based on it's current location - not original sides of view port.

<p>paragraph 1.</p>  <p>paragraph 2.</p>  <p style="position: relative;left: 2em;">paragraph 3.</p>

in above example, third paragraph positioned 3em left side of container element, still below first 2 paragraphs. remain in normal flow of document, , offset slightly. if changed position: absolute; following display on top of it, because no longer in normal flow of document.


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