vector-im-hydrogen-web/documentation/UI/render-dom-elements.md

There are two options to render DOM elements:

• Use tag from ui/general/html.js
• Use TemplateBuilder object (t) from the render function in the view.

Although syntactically similar, they are not functionally equivalent.
Primarily tag does not support bindings nor event handlers.

    // The onClick here wont work!!
    tag.button({className:"awesome-btn", onClick: () => this.foo()});

For these functionalities always use the TemplateBuilder object that is passed as argument to the render method.

    render(t, vm){
        // The onClick works here.
        t.button({className:"awesome-btn", onClick: () => this.foo()});
    }