external-image-with-relative-base-external-description-manual.html
<!DOCTYPE html>
<html>
<head>
<title>Longdesc test: External image, external description, relative base</title>
<base href="./rebased/">
</head>
<body>
<img src="picture2.png" alt="the image" longdesc="fail.html">
<p>If the image is broken, the base element has not been interpreted correctly so the test result is unknowable</p>
</body>
</html>