// Test setAttr
        tag.setAttr("data-role", "button");
        assertTrue(tag.toString().contains("attrName=data-role"));
        assertTrue(tag.toString().contains("attrValue=button"));

        // Test overwriting values
        tag.setId("new-id");
        tag.setCss("new-class");
        tag.setAttr("role", "link");

     * Sets a custom attribute name-value pair that this pruned tag should match.
     *
     * @param name the attribute name to match
     * @param value the attribute value to match
     */
    public void setAttr(final String name, final String value) {
        attrName = name;
        attrValue = value;
    }

    @Override
    public String toString() {

        which would previously raise an error. This will correspond to an
        attribute name with an embedded '.' symbol (e.g. 'a.b'), which can only
        be accessed indirectly (e.g. through getattr and setattr). To set this
        up the user will first need to explicitly add the variable to the hparam
        object (e.g. "hparams.add_hparam(name='a.b', value=0.0)").
    *   Benchmark for tf.scan in graph and eager modes.