Re: [w3c/manifest] Add `installed` CSS media feature (PR #1218)

@marcoscaceres commented on this pull request.



> +    <p>
+      The value of <a href="#mf-installed">`installed`</a> in a print context
+      MUST be <a href="#mf-installed-none">`none`</a>. Installation launch
+      context is not meaningful in print output.
+    </p>
+    <p class="note">
+      The <a href="#mf-installed">`installed`</a> media feature is designed to
+      be used in a boolean context. `@media (installed)` evaluates to true when
+      the value is <a href="#mf-installed-installed">`installed`</a> and false
+      when the value is <a href="#mf-installed-none">`none`</a>. The explicit
+      form `@media (installed: installed)` is valid but the idiomatic form is
+      the boolean shorthand `@media (installed)`.
+    </p>
+    <aside class="example">
+      <p>
+        Suppress install prompts when the app is already running as installed:

```suggestion
        Hide install prompts when the app is already running as installed:
```

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