border-left-width: 10em /* Any <length> value */
border-left-width: thin /* A keyword */
Is either a non-negative explicit <length> value or a keyword denoting the thickness of the left border. The keyword must be one of the following values:
A thin border
A medium border
A thick border
The specification doesn't define precisely the thickness of each fo the keywords, which is therefore implementation specific. Nevertheless, it requests that the thickness does follow the thin ≤ medium ≤ thick pattern and is constant on a single document.
Represents the calculated value of the border-left-width of the parent's element.
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