Function calculateSpecificity

  • Calculate the specificity of a single CSS selector.


    • selector: string

      The CSS selector of interest.

    Returns number

    The specificity of the selector.

    Undefined Behavior

    The selector is invalid.


    This is based on

    A larger number represents a more specific selector.

    The smallest possible specificity is 0.

    The result is represented as a hex number 0x<aa><bb><cc> where each component is the count of the respective selector clause.

    If the selector contains commas, only the first clause is used.

    The computed result is cached, so subsequent calculations for the same selector are extremely fast.

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