Video

🌐 HTML5 🟢 Chapter 21 of 37 📂 Phase 08: Audio, Video & Embeds 📅 2026 Edition

📌 Covered in this chapter: <video> Element · poster Attribute · <source> Formats (MP4, WebM) · <track> WebVTT Subtitles · Responsive Aspect Ratio

Welcome to Phase 8 (Chapter 21): Video! Embed video playback natively with the HTML5 <video> element, WebVTT closed captions (<track>), poster preview images, and responsive video aspect ratios.

1Video Player with Captions Syntax

HTML — Video Player with Captions ▶ Run in HTML Editor

<video controls poster="poster.jpg" width="640" height="360">
  <source src="video.mp4" type="video/mp4">
  <source src="video.webm" type="video/webm">
  <track kind="subtitles" src="subtitles-en.vtt" srclang="en" label="English" default>
</video>

Written by Our Compiler Technical Editorial Team
Reviewed for accuracy & tested on HTML5 Standards · Last updated August 2026