Create basic WebGL example

guide/src/SUMMARY.md

@@ -61,6 +61,7 @@
     - [The `fetch` API](./web-sys/examples/fetch.md)
     - [2D Canvas](./web-sys/examples/2d-canvas.md)
     - [WebAudio](./web-sys/examples/web-audio.md)
+    - [WebGL](./web-sys/examples/webgl.md)
     - [A Simple Paint Program](./web-sys/examples/paint.md)
 
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guide/src/web-sys/examples/webgl.md

@@ -0,0 +1,25 @@
+# 2D Canvas
+
+This example draws a triangle to the screen using the WebGL API.
+
+[See the full source at
+`wasm-bindgen/examples/webgl`.](https://github.com/rustwasm/wasm-bindgen/tree/master/examples/webgl)
+
+## `Cargo.toml`
+
+The `Cargo.toml` enables features necessary to obtain and use a WebGL
+rendering context.
+
+```toml
+{{#include ../../../../examples/webgl/Cargo.toml}}
+```
+
+## `src/lib.rs`
+
+This source file handles all of the necessary logic to obtain a rendering
+context, compile shaders, fill a buffer with vertex coordinates, and draw a
+triangle to the screen.
+
+```rust
+{{#include ../../../../examples/webgl/src/lib.rs}}
+```