Sign language is controllable

The rule checks that sign language can be turned on and off.

Applicability

This rule applies to any audio-only content or video with audio content that includes sign language interpretation.

Expectation

The test target has a control for the user to turn the sign language on or off. Except when the sign language is embedded or a part of the visible video itself.

Examples

Passed example 1

Show and hide sign language interpretation.

Content with audio includes a method to show and hide sign language interpretation.

  <figure>
    <figcaption>Latest podcast</figcaption>
    <audio controls src="latest-podcast.mp3"></audio>
    <video id="sign-video" controls width="250" style="display:none">
      <source src="latest-podcast-signed.webm" type="video/webm" />
    </video>
    <button onclick="toggleSign()">Toggle sign language</button>
  </figure>

  <script>
    function toggleSign() {
      var signVideo = document.getElementById("sign-video");
      if(signVideo.style.display === "none") {
        signVideo.style.display = "block";
      } else {
        signVideo.style.display = "none";
      }
    }
  </script>

Failed example 1

No way to switch sign language interpretation on or off.

Content with audio has no method to switch sign language interpretation on and off.

  <figure>
    <figcaption>Latest podcast</figcaption>
    <audio controls src="latest-podcast.mp3"></audio>
    <video controls width="250" style="display:none">
      <source src="latest-podcast-signed.webm" type="video/webm" />
    </video>
  </figure>