Sandbox for static html demos

This is a static template, there is no bundler or bundling involved!

• gsapScrollTrigger.html - demo of onUpdate method.
• shadowDom.html - shadow dom testing
• nestedAnchor.html - nested anchor is a bad idea. Use click event on parent instead.
• tapHighlight.html - fix for tap-highlight on mobile devices.
• hoverTouch.html - fix for on touch hover, click event gets fired.
• pipDemo.html - picture in picture API demo.