Function _update

docs/app/js/sanddance-app.js:124280–124291

* Update the attributes of an SVG element for a mark item. * @param {object} mdef - The mark definition object * @param {SVGElement} el - The SVG element. * @param {Item} item - The mark item.

(mdef, el, item)

   * @param {SVGElement} el - The SVG element.
   * @param {Item} item - The mark item.
   */ _update (mdef, el, item) {
        // set dom element and values cache
        // provides access to emit method
        element = el;
        values = el.__values__; // apply aria-specific properties
        ariaItemAttributes(emit, item); // apply svg attributes
        mdef.attr(emit, item, this); // some marks need special treatment
        const extra = mark_extras[mdef.type];
        if (extra) extra.call(this, mdef, el, item); // apply svg style attributes
        // note: element state may have been modified by 'extra' method
        if (element) this.style(element, item);
    },
    /**
   * Update the presentation attributes of an SVG element for a mark item.
   * @param {SVGElement} el - The SVG element.