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::before is suitable for decoration, but not for the main text
::before creates a pseudo-element before the selected element’s content.
Published22 Oct 2026
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Technology
Software, devices and technical concepts, explained clearly.
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Technology
::marker shapes the sign of the list
The number or point can be changed without removing the list structure.
Published22 Oct 2026
Technology
:autofill and the colors imposed by the browser
The automatically filled field may have a special appearance.
Published22 Oct 2026
Technology
:checked follows the current state of the selection
The selector reflects the interaction, not just the original HTML attribute.
Published22 Oct 2026
Technology
:disabled is a state, not just a gray color
The disabled control has a certain browser behavior.
Published22 Oct 2026
Technology
:empty and the empty space between tags
An item with no visible text is not always empty for the selector.
Published22 Oct 2026
Technology
:invalid: a control that fails browser validation
CSS can indicate a problem, but does not validate the server data.
Published22 Oct 2026
Technology
:not() excludes matching items
Denial refers to the selected item, not automatically to an entire branch.
Published22 Oct 2026
Technology
:nth-child() counts the position among all elemental children
Mixed tags affect the element number.
Published22 Oct 2026
Technology
:placeholder-shown does not mean just an empty field
The selector depends on the actual displayed placeholder.
Published22 Oct 2026
Technology
:target highlights purpose of address fragment
CSS can show which section the address leads to.
Published22 Oct 2026
Technology
:where() sets a style with zero specificity
It is suitable for initial rules, which components easily replace.
Published22 Oct 2026