Method _cleanupFontValue

src/material/icon/icon.ts:394–396

* Cleans up a value to be used as a fontIcon or fontSet. * Since the value ends up being assigned as a CSS class, we * have to trim the value and omit space-separated values.

(value: string)

   * have to trim the value and omit space-separated values.
   */
  private _cleanupFontValue(value: string) {
    return typeof value === 'string' ? value.trim().split(' ')[0] : value;
  }

  /**
   * Prepends the current path to all elements that have an attribute pointing to a `FuncIRI`