What are: horizontal and vertical pseudo selectors for?

Question

I wrote CSS in Visual Studio, and when writing a pseudo-selector, a code hint suggested :horizontal, so I noticed that there is a pseudo :horizontaland :vertical.

Visual Studio 2013 - 12.0.21005.1

What is this selector and when to use it?

It does not appear in Pseudo-Classes Docs MDN Standard Class Selector Values ...

Answer 1

This seems to be a WebKit-only creation.

: horizontal - a horizontal pseudo-class is applied to any scroll bar of a part that has a horizontal orientation.

: vertical - .

.

Answer 2

webkit:

• webkit-

• . !

---

:horizontal - , .

:vertical - , .

---

:decrement - . , (, , ).

:increment - . , (, , ).

:start - . , .

:end - . , .

:double-button - - . , , . , .

:single-button - - . , . , .

:no-button - , , .

:corner-present - , .

:window -inactive - , . ( :: . .)

Answer 3

They are selectors used for scroll bars. They are specific to WebKit.