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vanilla JavaScript set style on body

Why does this not work?

Using vanilla JavaScript to set the style on body tag?

<html>
   <body style="display:none;">
       test
   </body>
   <script>
       document.getElementsByTagName("body").style.display = "block";
   </script>
</html>
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Because getElementsByTagName() returns a NodeList, not a single element. Treat it as array:

document.getElementsByTagName("body")[0].style.display = "block";

Or even simpler in case of body:

document.body.style.display = "block";

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