Mathieu

Add an HtmlElement codec as required in the [material-component API](https://github.com/material-components/material-components-web-components/tree/master/packages/menu#propertiesattributes)

Attributes not generated

3

Hi, I try to play with the Menu. But some Menu attributes cannot be invoked. For instance ```anchor```. I can find it described in the [material.sc](https://github.com/uosis/laminar-web-components/blob/master/generator/material.sc#L1458:L1463) but for some reason...

onFocusMount

6

Hi, I am tryiing to reproduce [Laminar Hello World example](https://laminar.dev/examples/hello-world), but the ```onMountFocus``` raises a js exception. Is it an exepected behaviour ? ```scala val component = div( Textfield( _...