<lite-youtube>

A web component that renders YouTube embeds faster. The ShadowDom web component version of Paul's lite-youtube-embed.

Features

• No dependencies; it's just a vanilla web component.
• It's fast yo.
• It's Shadow Dom encapsulated!
• It's responsive 16:9
• It's accessible via keyboard and will set ARIA via the videotitle attribute
• It's locale ready; you can set the videoplay to have a properly locale based label
• Set the start attribute to start at a particular place in a video
• You can set autoload to use Intersection Observer to load the iframe when scrolled into view.
• Loads placeholder image as WebP with a Jpeg fallback
• new in v1.1: Adds nocookie attr for use with use youtube-nocookie.com as iframe embed uri
• new in v1.2: Adds playlistid for playlist loading interface support
• new in v1.3: Adds loading=lazy to image placeholder for more perf with posterloading attr if you'd like to use eager
• new in v1.4: Adds short attr for enabling experimental YouTube Shorts mobile interaction support. See (example video)[https://www.youtube.com/watch?v=aw7CRQTuRfo] for details.
• new in v1.5: Adds support for nonce attribute via window.liteYouTubeNonce for CSP 2/3 support.
• new in v1.6: Adds autoPause for pausing videos scrolled off screen; adds --lite-youtube-aspect-ratio CSS custom property create custom aspect ratio videos; adds --lite-youtube-frame-shadow-visible CSS custom property to disable frame shadow (flat look); adds a named slot image that allows for setting custom poster image; adds credentialless for COEP
• new in v1.7: Adds support for 404 fallback posters; add noscript injector to lightdom for search indexing (disable via disablenoscript attribute in v1.7.1).
• new in v1.8: Adds support for styling the play button via ::part (thank you @Lukinoh!).
• new in v1.9: Adds support for playlist thumbnails (thank you @arclight0).

Install via package manager

This web component is built with ES modules in mind and is available on NPM:

To install, use your package manager of choice:

npm i @justinribeiro/lite-youtube
# or
yarn add @justinribeiro/lite-youtube

After install, import into your project:

import '@justinribeiro/lite-youtube';

Install with CDN

If you want the paste-and-go version, you can simply load it via CDN:

<script type="module" src="https://cdn.jsdelivr.net/npm/@justinribeiro/lite-youtube@1/lite-youtube.min.js"></script>

Basic Usage

<lite-youtube videoid="guJLfqTFfIw"></lite-youtube>

Basic Usage with Fallback Link

A fallback appears in any of the following circumstances:

1. Before the component is initialized
2. When JS is disabled (like <noscript>)
3. When JS fails or the lite-youtube script is not loaded/executed
4. When the browser doesn't support web components

<lite-youtube videoid="guJLfqTFfIw">
  <a class="lite-youtube-fallback" href="https://www.youtube.com/watch?v=guJLfqTFfIw">Watch on YouTube: "Sample output of devtools-to-video cli tool"</a>
</lite-youtube>

Example CSS:

.lite-youtube-fallback {
	aspect-ratio: 16 / 9; /* matches YouTube player */
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction: column;
	gap: 1em;
	padding: 1em;
	background-color: #000;
	color: #fff;
	text-decoration: none;
}

/* right-facing triangle "Play" icon */
.lite-youtube-fallback::before {
	display: block;
	content: '';
	border: solid transparent;
	border-width: 2em 0 2em 3em;
	border-left-color: red;
}

.lite-youtube-fallback:hover::before {
	border-left-color: #fff;
}

.lite-youtube-fallback:focus {
	outline: 2px solid red;
}

Playlist Usage

Setting the YouTube playlistid allows the playlist interface to load on interaction. Note, this still requires a videoid for to load a placeholder thumbnail as YouTube does not return a thumbnail for playlists in the API.

<lite-youtube
  videoid="VLrYOji75Vc"
  playlistid="PL-G5r6j4GptH5JTveoLTVqpp7w2oc27Q9"
></lite-youtube>

Add Video Title

<lite-youtube
  videotitle="This is a video title"
  videoid="guJLfqTFfIw"
></lite-youtube>

Update interface for Locale

<lite-youtube
  videoplay="Mirar"
  videotitle="Mis hijos se burlan de mi español"
  videoid="guJLfqTFfIw"
>
</lite-youtube>

Style It

Height and Width are responsive in the component.

<style>
  .styleIt {
    width: 400px;
    margin: auto;
  }
</style>
<div class="styleIt">
  <lite-youtube videoid="guJLfqTFfIw"></lite-youtube>
</div>

Enable YouTube Shorts interaction on mobile

See the example video of how this feature works for additional details.

<lite-youtube videoid="vMImN9gghao" short></lite-youtube>

AutoLoad with IntersectionObserver

Uses Intersection Observer if available to automatically load the YouTube iframe when scrolled into view.

<lite-youtube videoid="guJLfqTFfIw" autoload> </lite-youtube>

Set a video start time

<!-- Start at 5 seconds -->
<lite-youtube videoid="guJLfqTFfIw" videoStartAt="5"></lite-youtube>

Fine tune the poster quality for a video

<lite-youtube
  videoid="guJLfqTFfIw"
  posterquality="maxresdefault"
></lite-youtube>

Use the named slot to set a custom poster image

<lite-youtube videoid="guJLfqTFfIw">
  <img slot="image" src="my-poster-override.jpg">
</lite-youtube>

Set custom aspect ratio

<style>
  lite-youtube {
    --lite-youtube-aspect-ratio: 2 / 3;
  }
</style>
<lite-youtube videoid="guJLfqTFfIw"></lite-youtube>

Disable the frame shadow (flat look)

<style>
  lite-youtube {
    /* No Shadow */
    --lite-youtube-frame-shadow-visible: no;
  }
</style>
<lite-youtube videoid="guJLfqTFfIw"></lite-youtube>

Customize the play button

<style>
  lite-youtube::part(playButton) {
    /* You custom style */
  }
</style>
<lite-youtube videoid="guJLfqTFfIw"></lite-youtube>

Auto-Pause video when scrolled out of view

Note: the custom poster image will load with this set, but will then disappear without any user interaction because of the intersection observer starting.

 <lite-youtube videoid="VLrYOji75Vc" autopause></lite-youtube>

NoScript disable

As of v1.7.0, we inject into the lightdom a noscript for SEO help. This can conflict with server side rendered noscript injects. To disable, simply pass disablenoscript to the component:

 <lite-youtube videoid="VLrYOji75Vc" disablenoscript></lite-youtube>

YouTube QueryParams

Use any YouTube Embedded Players and Player Parameters you like.

Note: the exception to this rule is the autoplay param; because of the nature of the performance loading and the inconsistency of usage, that parameter generally does not work. See this comment for details.

<lite-youtube videoid="guJLfqTFfIw" params="controls=0&enablejsapi=1">
</lite-youtube>

Attributes

The web component allows certain attributes to be give a little additional flexibility.

Name	Description	Default
videoid	The YouTube videoid	``
playlistid	The YouTube playlistid; requires a videoid for thumbnail	``
videotitle	The title of the video	Video
videoplay	The title of the play button (for translation)	Play
videoStartAt	Set the point at which the video should start, in seconds	0
posterquality	Set thumbnail poster quality (maxresdefault, sddefault, mqdefault, hqdefault)	hqdefault
posterloading	Set img lazy load attr loading for poster image	lazy
nocookie	Use youtube-nocookie.com as iframe embed uri	false
autoload	Use Intersection Observer to load iframe when scrolled into view	false
autopause	Use video auto-pausing when scrolled out of view	false
short	Show 9:16 YouTube Shorts-style interaction on mobile devices	false
disablenoscript	Disables noscript injector added to lightdom for search indexing	false
params	Set YouTube query parameters	``

Events

The web component fires events to give the ability understand important lifecycle.

Event Name	Description	Returns
liteYoutubeIframeLoaded	When the iframe is loaded, allowing us of JS API	detail: { videoId: this.videoId }