What significance do the variations of `p-N` hold within Bootstrap v4?

The naming convention used in Bootstrap v4 seems a bit cryptic to me.

While I understand the desire to keep classes minimal and clean, I am struggling to make sense of it. I can make educated guesses, but I'm unable to find definitive answers.

p-1, p-2, p-N: These seem to be related to Flexbox, but what does the p actually mean?
d-flex: Also Flexbox related, but the d has me puzzled. Could it stand for display?
mr-auto - Is this perhaps margin-related like margin-right-auto? I can't find confirmation in the documentation.
mt-auto - What about this one?
ml-auto - Any insights on this class?

Answer №1

The latest addition to Bootstrap is the convenient spacing utility classes which are designed for ease of use:

p-* applies padding on all sides.
m-* adds margin on all sides.
pl-* specifically pads the left side.
mt-* gives margin at the top.
mr-auto automatically sets margin on the right side.

For a live demonstration, check out this Spacing Utils Demo.

In addition to spacing utilities, there are also various display properties available.

These include d-block, d-flex, d-inline-block, d-none and more.

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