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<!DOCTYPE html>
<html>
<body>
<?php
// Some browsers will not display the content if it is too short
// We use str_pad() to make the output long enough
echo str_pad("Hello World!", 4096);
// Use flush() to send the string to the browser
flush();
// Display the rest of the content three seconds later
sleep(3);
echo "<br>";
echo "Hello World!";
?>
</body>
</html>
Hello World!
Hello World!