display

It is documented as part of the CSS Display specification.

Syntax

/* Usage Example */
.flex-container {
  display: flex;
  /* enables flexbox layout for children */
}
.hidden{
  display: none;
  /* removes element from document flow entirely */
}

/* Global values */
display: inherit;
display: initial;
display: revert;
display: revert-layer;
display: unset;