Which of the following selector same as :after; changed under CSS3 to make pseudo-elements obvious?

The correct answer is A. ::after.

A pseudo-element is a type of CSS selector that allows you to style specific parts of an element that do not exist in the HTML markup. The ::after pseudo-element is used to add content after an element, while the :after pseudo-element is used to add content after an element’s content.

The ::after pseudo-element was introduced in CSS3 to make pseudo-elements more obvious. The :after pseudo-element was deprecated in CSS3 in favor of the ::after pseudo-element.

Here is an example of how to use the ::after pseudo-element:

css
p::after {
content: "Hello, world!";
color: red;
}

This code will add the text “Hello, world!” after each paragraph element.

Here is an example of how to use the :after pseudo-element:

css
p:after {
content: "Hello, world!";
color: red;
}

This code will add the text “Hello, world!” after the content of each paragraph element.

The ::after pseudo-element is more flexible than the :after pseudo-element because it can be used to add content to any part of an element, not just the content.