To Use or Not to Use Unit Identifiers for Zero Values in CSS?

CSS Property Units: Optional for Zero Values

CSS properties can be written with or without unit identifiers, such as "0" or "0px." While both notations are valid, the choice between them is a matter of preference and readability.

Unit Identifiers

In CSS, unit identifiers are used to specify the units of measurement for properties such as length, width, height, and margin. Common unit identifiers include px (pixels), em (font-size relative to the parent element), and % (percentage of the parent element's size).

Zero Values

According to the CSS specifications, unit identifiers are optional for zero values. This means that either "property: 0;" or "property: 0px;" is valid.

Performance Considerations

There is no notable performance difference between using or omitting unit identifiers for zero values. However, some developers may find it cleaner and more readable to include the units, even for zero values.

Conclusion

Ultimately, the decision of whether to use unit identifiers for zero values in CSS is a matter of personal preference. Both notations are valid and interpretable by browsers.

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