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Add mention of CORERUN_IN_BROWSER variable #126143

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MichalStrehovsky merged 1 commit into from
Mar 26, 2026
Merged

Add mention of CORERUN_IN_BROWSER variable #126143

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8 changes: 5 additions & 3 deletions docs/workflow/building/coreclr/wasm.md
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Expand Up @@ -40,6 +40,10 @@ This command will:

### Browser Testing (Recommended)

To enable the browser workflow, edit `src/coreclr/hosts/corerun/CMakeLists.txt` and set the `CORERUN_IN_BROWSER` variable to 1.

You will also need to ensure the `WASM_PRELOAD_DIR` (see `src/coreclr/hosts/corerun/CMakeLists.txt`) is populated during a build of `corerun` so the virtual file system is created. This will require the copying of the libraries (see Console Testing details below) and `HelloWorld.dll` into `./artifacts/bin/coreclr/browser.wasm.Debug/IL` and then the corerun project will then need to be rebuilt.
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If you don't have `dotnet-serve` installed, you can install it as a global .NET tool with:

```bash
Expand All @@ -56,9 +60,7 @@ dotnet-serve --directory "artifacts/bin/coreclr/browser.wasm.Debug"
dotnet-serve --directory "artifacts\bin\coreclr\browser.wasm.Debug"
```

This will start a local HTTP server and you can open the provided URL in your browser.

You will also need to ensure the `WASM_PRELOAD_DIR` (see `src/coreclr/hosts/corerun/CMakeLists.txt`) is populated during a build of `corerun` so the virtual file system is created. This will require the copying of the libraries (see Console Testing details below) and `HelloWorld.dll` into `./artifacts/bin/coreclr/browser.wasm.Debug/IL` and then the corerun project will then need to be rebuilt.
This will start a local HTTP server and you can open the provided URL in your browser. The entry point is the corerun.html file. If you don't see corerun.html, you didn't set the `CORERUN_IN_BROWSER` variable when building the `clr` subset.

### Console Testing

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