Sign Language

title: "Sign Language — Providing Sign Language Interpretation for Video" description: "Learn how to provide sign language interpretation for video content, meeting WCAG AAA requirements and supporting deaf users who use sign language." weight: 6 date: 2026-06-28 lastmod: 2026-06-28 tags: [accessibility, media]

Sign language interpretation provides video content in a sign language for users who are deaf and whose primary language is sign language rather than written text.

## What You'll Learn

How to provide sign language interpretation, when it is needed, and how to integrate it with video content.

## Why It Matters

For many deaf users, written language is a second language. Sign language is their primary language. Captions may not be sufficient for full comprehension.

## Real-World Use

A deaf user whose first language is ASL watches a tutorial. A sign language interpreter appears in a picture-in-picture window translating the audio into ASL.

## Sign Language Video

```html
<video controls>
  <source src="tutorial.mp4" type="video/mp4">
  <!-- Sign language track as alternative video -->
  <track kind="captions" src="captions.vtt" default>
</video>

<!-- Separate sign language video -->
<video class="sign-language" controls
       aria-label="Sign language interpretation">
  <source src="tutorial-asl.mp4" type="video/mp4">
</video>

Picture-in-Picture Layout

.video-container {
  position: relative;
  width: 100%;
  max-width: 800px;
}

.sign-language {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  width: 200px;
  height: 150px;
  border: 2px solid #fff;
  border-radius: 4px;
}

Common Mistakes

1. Interpreter obstructs content

Place the interpreter in a corner that does not block important video content.

2. Poor lighting on interpreter

Ensure the interpreter is well-lit and clearly visible.

3. Interpreter too small

The interpreter window should be large enough to see hand movements and facial expressions.

4. No separate control for interpreter

Users may want to show or hide the interpreter independently.

5. Assuming captions are enough

For deaf users whose first language is sign language, captions are not equivalent to sign language.

Practice Questions

1. What WCAG level requires sign language? WCAG AAA (1.2.6) requires sign language interpretation. It is not required at AA level.

2. Why might captions be insufficient for some deaf users? For deaf users whose first language is ASL or another sign language, written language is a second language.

3. How should the interpreter be positioned on screen? In a corner (typically lower right) that does not obstruct important video content.

Challenge: Design a video player layout that includes a sign language interpretation window with proper controls.

FAQ

Mini Project

Research sign language interpretation services for your target language. Create a video player mockup with picture-in-picture sign language display.

What's Next

Learn about Accessible Media Players and how to choose or build a player with accessible controls.