OrbitControls Keyboard controls don't work when in an Iframe

[greggman]

Description of the problem

The keyboard for OrbitControls don't work in an iframe. The reason is the mousedown handler calles preventDefault. Part of that default is the iframe getting the focus

See this example: https://jsfiddle.net/3foLr7sn/ or this one https://jsfiddle.net/qgu17w5o/ both are the default bug report examples

Drag on the sphere then press the arrow keys. Note they don't work

Three.js version

• Dev
• r100

Browser

• All of them
• Chrome
• Firefox
• Internet Explorer

OS

• All of them
• Windows
• macOS
• Linux
• Android
• iOS

Hardware Requirements (graphics card, VR Device, ...)

N/A

[Mugen87]

see #9437