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HTML DOMTokenList supports()
tryjsref_element_classlist_supports
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<!DOCTYPE html> <html> <body> <h1>The DOMToken Object</h1> <h2>The supports() Method</h2> <iframe id="myFrame"></iframe> <p>The ifame supports "allow-forms":</p> <p id="demo"></p> <script> const list = document.getElementById("myFrame").sandbox; document.getElementById("demo").innerHTML = list.supports("allow-forms"); </script> </body> </html>