Let's break down what's causing this error and how to fix it:

The Root Cause #

Your code is mixing up Google Apps Script HTML template syntax incorrectly. The <?!= tag expects a valid JavaScript expression (like a string variable, a function that returns HTML, or a quoted HTML string), but you're directly placing raw HTML tags right after it. The parser sees the < from <p> as an unexpected token because it doesn't belong in a JavaScript expression context.

Corrected Code Options #

You have two clean ways to fix this:

Option 1: Use Standard Template Conditional Syntax

Wrap your logic in <? ?> tags and write the HTML directly outside them:

"<? if (authorized) { ?>
  <p><span style='color:green'>Authorized Successfully</span></p>
<? } else { ?>
  <p><span style='color:red'>Not Authorized</span></p>
<? } ?>".evaluate()

Option 2: Use a Ternary Expression with <?!=

If you prefer using <?!=, wrap your HTML in quotes to turn it into a valid string expression (note the escaped double quotes inside the style):

"<?!= authorized ? '<p><span style=\"color:green\">Authorized Successfully</span></p>' : '<p><span style=\"color:red\">Not Authorized</span></p>' ?>".evaluate()

Why This Works #

Google Apps Script's HTML templating engine parses <? ?> as executable script blocks, and <?!= as a way to output unescaped content from a JavaScript expression. By either separating your logic from the HTML (Option 1) or turning the HTML into a string expression (Option 2), you're giving the parser valid syntax to work with, eliminating the unexpected < token error.

内容的提问来源于stack exchange，提问作者Tomas Forsythe