There are instances where I have pages that contain only a script without any content (such as sending data through postMessage and then closing itself).
In these cases, is the page considered valid with just
<script>doSomeStuff</script><!DOCTYPE html>
<html>
<script>doSomeStuff</script>
</html>
Alternatively, does the page require a full HTML declaration like this:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>doSomeStuff</script>
</head>
</html>
It might be advisable to include <meta charset="UTF-8"> in order to prevent encoding errors and ensure proper interpretation of the script.