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Html tag beginning with question mark?

I'm learning google apps script, and in this tutorial, I saw some weird looking syntax: <? /* JS code */ ?> and <?= /* JS code */ ?>

<!DOCTYPE html>
<html>
  <head>
    <base target="_top">
    <title>Message Display Test</title>
    <link rel="stylesheet" href="https://ssl.gstatic.com/docs/script/css/add-ons1.css">
  </head>
  <body style="padding:3em;">
  <h1>Messages</h1>
    <ul>
    <? for(var m=0;m<messages.length;m++){ ?>
    <li><?= messages[m].getSubject() ?></li>
    <p><?= messages[m].getPlainBody() ?></p>
    <? } ?>
    </ul>
  </body>
</html>

I can kind of understand what is going on, but I'm still confused. I've never seen these while learning HTML. How does this compare to script tags?

Solution

  • In Google Apps Script <? . . .?> are called standar scriptlets, <?= . . . ?> are printed scriptlets and <?!= . . . ?> are force printing scriplets. They are used in Google Apps Script HTML Service templated HTML.

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