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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<script>
add_task(async function() {
let seenPaste = false;
let seenCopy = false;
document.addEventListener("copy", function oncpy(e) {
e.clipboardData.setData("text/plain", "my text");
e.preventDefault();
seenCopy = true;
}, {once: true});
document.addEventListener("paste", function onpst(e) {
is(e.clipboardData.getData("text/plain"), "my text",
"The correct text was read from the clipboard");
e.preventDefault();
seenPaste = true;
}, {once: true});
ok(SpecialPowers.wrap(document).execCommand("copy"),
"Call should succeed");
ok(seenCopy, "Successfully copied the text to the clipboard");
ok(SpecialPowers.wrap(document).execCommand("paste"),
"Call should succeed");
ok(seenPaste, "Successfully read text from the clipboard");
// Check that reading text from the clipboard in non-privileged contexts
// still doesn't work.
function onpstfail(e) {
ok(false, "Should not see paste event triggered by non-privileged call");
}
document.addEventListener("paste", onpstfail);
ok(!document.execCommand("paste"), "Call should fail");
document.removeEventListener("paste", onpstfail);
});
</script>
</body>
</html>