CSS: 'property: 0' vs 'property: 0px' - Which Should You Use?

CSS: 'property: 0' vs 'property: 0px'

In CSS, you can often find declarations using both 'property: 0;' and 'property: 0px;'. While both notations are syntactically valid, they seem similar and raise the question of whether there is any notable difference between them.

Optional Unit Identifiers

The key understanding here is that unit identifiers (such as 'px' or 'em') are optional for zero lengths. This is specified in the CSS2 and CSS3 specifications.

Performance

Some might prefer using 'property: 0;' due to its brevity (two characters shorter). However, there is no significant performance advantage to using one notation over the other. Browsers interpret both 'property: 0;' and 'property: 0px;' identically.

Recommendation

Ultimately, the choice between 'property: 0;' and 'property: 0px;' is a matter of preference. If you prioritize visual cleanliness, 'property: 0px;' might be preferable. However, if you're concerned about file size or readability, 'property: 0;' is a viable alternative.

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