Hey there! Let's break down why your Mustache syntax is showing up as raw text sometimes, even when your code looks identical at first glance. The root issue almost always ties back to how your framework's template parser handles whitespace, hidden characters, or structural formatting.

Common Causes #

• Whitespace/Line Break Parsing Quirks
  Most frameworks that use Mustache-style syntax (like Vue) have template parsers that are surprisingly picky about whitespace structure. If there's an unexpected line break, inconsistent indentation, or extra spaces between the <template> tag and your root <div>, the parser might accidentally treat {{ myVar }} as plain text instead of a template variable. When you adjust the root element's position or cram everything onto one line, you eliminate those problematic whitespace gaps, letting the parser correctly recognize the variable.

• Invisible Special Characters
  Sometimes when copying/pasting code, you end up with hidden characters (like full-width spaces, zero-width spaces, or non-breaking spaces) that you can't see but the parser can. These tiny nuisances break the parser's ability to recognize the {{ }} syntax as a template directive. Rearranging the code or rewriting it from scratch gets rid of these hidden issues.

• Framework Version/Configuration Differences
  Older versions of frameworks (e.g., Vue 2 vs. Vue 3) have stricter template parsing rules. Some might require the root element to sit immediately after the <template> tag with no extra line breaks, or your project might have a linting/parsing config that enforces rigid formatting. Minor inconsistencies can trigger the parser to fall back to rendering plain text.

Fixes to Try #

• Standardize Your Template Formatting
  Stick to consistent indentation (use tabs or spaces, not both) and keep your root element closely aligned under the <template> tag, like this:

  <template>
    <div>
      <p>{{ myVar }}</p>
    </div>
  </template>
  

  Avoid random line breaks or extra spaces between the <template> opening tag and your root element.

• Check for Invisible Characters
  Paste your code into a plain-text editor (like VS Code with the "Render Whitespace" setting enabled, or Notepad++) to spot any hidden characters. Delete them and rewrite the template structure cleanly.

• Verify Framework Setup
  If you're using Vue, check your project's vue.config.js for any strict template parsing settings, or consider upgrading to a more recent stable version of the framework to take advantage of more reliable, lenient parsing.

内容的提问来源于stack exchange，提问作者Daniel Scharkov