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Update hololens documentation.

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## Servo on Hololens.
# Using Servo on HoloLens 2
How to compile and run:
To build Servo for the HoloLens 2, see [the wiki](https://github.com/servo/servo/wiki/Building-for-UWP).
In your Visual Studio 2017 cmd prompt:
- compile servo: `mach build -d --uwp`
## Web development workflow
Install [HoloLens 2 Emulator](https://docs.microsoft.com/en-us/windows/mixed-reality/using-the-hololens-emulator).
#### To load a page without typing on the on-screen keyboard:
1. ensure Firefox Reality is installed
1. create a QR code for `fxr://[url]` (eg. https://www.qr-code-generator.com/)
1. display it on some visible screen or surface (relatively large)
1. point the HoloLens towards the QR code, wait until it is recognised
1. accept the prompt to open the URL in Firefox Reality
With Visual Studio 2017:
- Open `support\hololens\ServoApp.sln`
- Select emulator or local machine, select configuration (Debug or Release) and press run
- VS will look for the DLLs and .h in `../../target/debug|release/` (depending on the configuration you selected in VS) and copy them in the final package.
#### Viewing JS output and exceptions
For now, it's not possible to interact with the web page.
1. Press the "developer" button to the right of the URL bar in Firefox Reality
1. A panel appears at the bottom of the app which acts as a JS console for the current page.
Note: to build the project with MSBuild:
- `MSBuild ServoApp.sln /p:Configuration=Debug /p:Platform=x64`
#### Viewing JS output and exceptions in immersive mode
Before entering immersive mode, use the desktop Firefox [remote developer tools](https://github.com/servo/servo/wiki/Devtools)
to access the Firefox Reality JS console.
## Exiting immersive mode
#### Pausing immersive mode
Use the default "bloom gesture" (two fingers on a wrist) to pause immersive mode and return to the home environment.
Tap the Firefox Reality app to re-enter immersive mode and continue interacting with web content.
#### Exiting immersive mode
Use the "palm gesture" - hold your palm parallel to your face for several seconds. A prompt will appear which
will allow you to cancel the prompt exit or exit immersive mode and return to the 2d browsing session.
#### Exiting immersive mode via web content
If your content can respond to user interaction events, invoking the [XrSession.end](https://immersive-web.github.io/webxr/#dom-xrsession-end)
API will exit immersive mode and return to 2d browsing.
## Reporting issues
If your web content is not rendering the same as other browsers, or is throwing exceptions that only appear in Firefox Reality,
please [file an issue](https://github.com/servo/servo/issues/new)! When possible, please provide a link that demonstrates the problem.