testing/web-platform/tests/conformance-checkers/html-its/allowedcharacters/html/allowedcharacters1html.html


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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset=utf-8>
    <title>Example</title>
  </head>
  <body>
    <p>Login names can only use letters from A to Z (upper or lowercase)
    and the character underscore (_) and minus (-).
    For example: <code its-allowed-characters="[a-zA-Z_\-]">Huck_Finn</code>.</p>
  </body>
</html>