`<noscript>` equivalent for `<mr-app>`

[lobau]

when using Javascript, you can define a <noscript> tag that only displays if the browser's javascript is disabled https://developer.mozilla.org/en-US/docs/Web/HTML/Element/noscript

I think it would be cool if mr-app had something similar. Maybe it's mr-noxr or something, for when the user is not in XR. That would allow people to only support XR for their app, while having a nice simple HTML page visible when you are not in XR.

Proposal:

<mr-app>
    <mr-panel>
        <mr-text class="title">Hello world!</mr-text>
        <mr-text>This is an mr-app</mr-text>
    </mr-panel>
    <mr-noxr>
        <h1>Hello world!</h1>
        <p>Please visit this page in your VR headset to get started!</p> 
    </mr-noxr>
</mr-app>