What is the Key Difference Between `all: unset` and `all: revert` in CSS?

Understanding the Difference Between all: unset and all: revert in CSS

The unset keyword in CSS helps reset a property to its inherited value if it inherits from its parent, and to its initial value if it doesn't inherit. This means it behaves like the inherit keyword in the first case, and like the initial keyword in the second case.

On the other hand, the revert keyword takes a slightly different approach. It reverts the cascaded value of the property from its current value to the value it would have had if no changes had been made by the current style origin to the current element.

Now, let's delve into the difference highlighted in the provided quote from MDN:

Browser and Custom Stylesheets

The key distinction between unset and revert lies in their treatment of properties that have values set by the browser or by custom stylesheets created by users (set on the browser side).

When using all: unset, the browser-set or user-set values for properties are replaced with the inherited or initial values. In contrast, all: revert is unique in its ability to revert specific properties to their state before the browser or user stylesheets intervened.

Example

Consider the following CSS snippet:

p {
  margin: 50px;
}

Let's assume this browser applies this default margin style to all

elements. Now, if we use:

<p></p>

The margin property will revert back to its original state, as if the browser had not applied its default style.

However, using:

<p></p>

will reset the margin to its inherited value, which would typically be 0. So, in this case, unset will not restore the original margin set by the browser, while revert will.

In conclusion, all: unset focuses on resetting properties to their inherited or initial values, while all: revert emphasizes restoring properties to their original state prior to any browser or user stylesheet modifications.

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