Add dependency to without-a-bundler guide
Fixes
@@ -9,7 +9,20 @@ browser directly. For this deployment strategy bundlers like Webpack are not
required. For more information on deployment see the [dedicated
documentation][deployment].
-First let's take a look at the code and see how when we're using `--target web`
+First, you'll need to add `web-sys` to your Cargo.toml.
+```toml
+[dependencies.web-sys]
+version = "0.3.4"
+features = [
+ 'Document',
+ 'Element',
+ 'HtmlElement',
+ 'Node',
+ 'Window',
+]
+```
+
+Then, let's take a look at the code and see how when we're using `--target web`
we're not actually losing any functionality!
```rust
