When defining size in margin/padding etc in CSS I often miss out ‘px’ for

Question

Asked: June 17, 20262026-06-17T06:09:51+00:00 2026-06-17T06:09:51+00:00

When defining size in margin/padding etc in CSS I often miss out ‘px’ for the value ‘0’ e.g.

.myClass {
  5px 0 0 5px
}

I have recently been told by someone I work with to include ‘px’

.myClass {
  5px 0px 0px 5px
}

Is there any advantages or disadvantages or either approach? or is this just preference?

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Editorial Team · Answer 1 · 2026-06-17T06:09:52+00:00

Editorial Team

No disadvantages, you can use 0 without “px”.

A zero length may be represented instead as the ‘0’. (In
other words, for zero lengths the unit identifier is optional.)

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