Disallow invalid named grid areas.
a { grid-template-areas:
"a a a"
"b b b"; }
/** ↑
* This named grid area */For a named grid area to be valid, all strings must define:
- the same number of cell tokens
- at least one cell token
And all named grid areas that spans multiple grid cells must form a single filled-in rectangle.
The following patterns are considered problems:
a { grid-template-areas: "" }a { grid-template-areas: "a a a"
"b b b b"; }a { grid-template-areas: "a a a"
"b b a"; }The following pattern is not considered a problem:
a { grid-template-areas: "a a a"
"b b b"; }