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    Function getCssVar

    • Attempts to get the value associated with CSS variable name from the target.

      If no target is specified, uses documentElement (i.e. :root).

      If found, the value is coerced to a numeric value if number-like, or a boolean if "true" or "false". All CSS variables are technically strings, but it's nice to get/set the actual type without worrying about string conversion first.

      Type Parameters

      • V extends CssVarValue = string

        Type of value to return.

      Parameters

      • name: `--${string}`

        Name of the variable to get value for.

      • Optionaltarget: null | Target = document.documentElement

        Optional Element, EventTarget, or CSS selector.

      Returns undefined | V

      Value associated with the name or undefined if it doesn't exist.

      The function throws if the target doesn't exist, rather than just falling back to the :root element. If you specify a target, you probably want to get the CSS variable on that target.

      InvalidCssVarError if the specified name is invalid.

      elements!InvalidElementError if the specified target wasn't found.

      HTML

      <style>
        :root {
          --color-fg: green;
        }
      </style>

      <button id="example" style="--color-bg: blue; --gap: 24;">
        Example
      </button>

      Get from Element

      const element = findElement("#example")!;

      getCssVar("--color-bg", element);
      // "blue"

      getCssVar("--gap", element);
      // 24

      Get from :root

      getCssVar("--color-fg");
      // "green"

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