feat(site): poster API reference

Closes #520

site/src/components/docs/demos/poster/html/css/BasicUsage.astro

@@ -0,0 +1,10 @@
+---
+import HtmlDemo from '@/components/docs/demos/HtmlDemo.astro';
+import html from './BasicUsage.html?raw';
+import './BasicUsage.css';
+---
+
+<HtmlDemo html={html} />
+<script>
+  import './BasicUsage.ts';
+</script>

site/src/components/docs/demos/poster/html/css/BasicUsage.css

@@ -0,0 +1,52 @@
+.poster-basic {
+  display: block;
+  position: relative;
+}
+
+.poster-basic video {
+  width: 100%;
+}
+
+.poster-basic__poster {
+  position: absolute;
+  inset: 0;
+  pointer-events: none;
+  transition: opacity 0.25s;
+}
+
+.poster-basic__poster:not([data-visible]) {
+  opacity: 0;
+}
+
+.poster-basic__poster img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+
+.poster-basic__button {
+  position: absolute;
+  bottom: 10px;
+  left: 10px;
+  padding-block: 8px;
+  background: rgba(255, 255, 255, 0.75);
+  backdrop-filter: blur(10px);
+  color: black;
+  border: 1px solid rgba(255, 255, 255, 0.25);
+  border-radius: 9999px;
+  padding-inline: 16px;
+  cursor: pointer;
+}
+
+.poster-basic__button .show-when-paused,
+.poster-basic__button .show-when-playing {
+  display: none;
+}
+
+.poster-basic__button[data-paused] .show-when-paused {
+  display: inline;
+}
+
+.poster-basic__button:not([data-paused]) .show-when-playing {
+  display: inline;
+}

site/src/components/docs/demos/poster/html/css/BasicUsage.html

@@ -0,0 +1,17 @@
+<video-player class="poster-basic">
+    <video
+        src="https://stream.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/highest.mp4"
+        playsinline
+    ></video>
+
+    <media-poster class="poster-basic__poster">
+        <img
+            src="https://image.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/thumbnail.jpg"
+        />
+    </media-poster>
+
+    <media-play-button class="poster-basic__button">
+        <span class="show-when-paused">Play</span>
+        <span class="show-when-playing">Pause</span>
+    </media-play-button>
+</video-player>

site/src/components/docs/demos/poster/html/css/BasicUsage.ts

@@ -0,0 +1,3 @@
+import '@videojs/html/video/player';
+import '@videojs/html/ui/play-button';
+import '@videojs/html/ui/poster';

site/src/components/docs/demos/poster/react/css/BasicUsage.css

@@ -0,0 +1,35 @@
+.poster-basic {
+  position: relative;
+}
+
+.poster-basic video {
+  width: 100%;
+}
+
+.poster-basic__poster {
+  position: absolute;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  pointer-events: none;
+  transition: opacity 0.25s;
+}
+
+.poster-basic__poster:not([data-visible]) {
+  opacity: 0;
+}
+
+.poster-basic__button {
+  position: absolute;
+  bottom: 10px;
+  left: 10px;
+  padding-block: 8px;
+  background: rgba(255, 255, 255, 0.75);
+  backdrop-filter: blur(10px);
+  color: black;
+  border: 1px solid rgba(255, 255, 255, 0.25);
+  border-radius: 9999px;
+  padding-inline: 16px;
+  cursor: pointer;
+}

site/src/components/docs/demos/poster/react/css/BasicUsage.tsx

@@ -0,0 +1,25 @@
+import { createPlayer, features, PlayButton, Poster, Video } from '@videojs/react';
+
+import './BasicUsage.css';
+
+const Player = createPlayer({ features: [...features.video] });
+
+export default function BasicUsage() {
+  return (
+    <Player.Provider>
+      <Player.Container className="poster-basic">
+        <Video src="https://stream.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/highest.mp4" playsInline />
+
+        <Poster
+          className="poster-basic__poster"
+          src="https://image.mux.com/lhnU49l1VGi3zrTAZhDm9LUUxSjpaPW9BL4jY25Kwo4/thumbnail.jpg"
+        />
+
+        <PlayButton
+          className="poster-basic__button"
+          render={(props, state) => <button {...props}>{state.paused ? 'Play' : 'Pause'}</button>}
+        />
+      </Player.Container>
+    </Player.Provider>
+  );
+}