Is there a difference between using left:0; and left:0px;? From what I've noticed, both seem to work fine without any issues in Firefox's error console. Just curious if they have the same interpretation.
I am working on some JavaScript that involves moving and resizing items. I assume that the response to the first question will also apply to whether height:0; is equivalent to height:0px;.
Zero remains constant no matter the unit used, making it essentially the same across all measurements.
When dealing with non-zero values, both the dimension and unit must be specified for accuracy.
The left property specification is outlined below:
'left'
Value: <length> | <percentage> | auto | inherit
Examining the content of <length>, as stated in the specification document:
Lengths are indicative of distance and are typically represented by symbols such as 'in'. They are dimensions and can also be expressed as '0' without specifying a unit. This means that unit identifiers are not mandatory for zero lengths.
When it comes to CSS, the number 0 can be used without a unit and will still be recognized as zero by browsers.
However, if you use a value greater than 0, you must include a unit for it to be interpreted correctly.
When it comes to CSS, the value of 0 in any unit will always be equal to 0. It is unnecessary to specify the unit for this zero value.
The official specification emphasizes this point with a reference to The CSS Values and Units Module:
Following a zero length in CSS, specifying the unit is not required.
It's irrelevant.
position:absolute;
left:0%;
All of them are equivalent to 0.
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