Method setAttribute

src/domTree.ts:243–245

* Sets an arbitrary attribute on the span. Warning: use this wisely. Not * all browsers support attributes the same, and having too many custom * attributes is probably bad.

(attribute: string, value: string)

     * attributes is probably bad.
     */
    setAttribute(attribute: string, value: string) {
        this.attributes[attribute] = value;
    }

    hasClass(className: string): boolean {
        return this.classes.includes(className);