Are HTML Comments in Script Tags Still Useful?

HTML Comments within Script Tags: A Dubious Practice

Many developers have relied on HTML comments within script tags to prevent outdated browsers from rendering JavaScript code. However, the proliferation of JavaScript-enabled browsers has rendered this practice largely obsolete.

Why Eliminate HTML Comments in Script Tags?

Today, nearly all browsers understand script blocks, even if they cannot interpret JavaScript. This means that comments are no longer necessary to conceal the code from incompatible browsers.

Matt Kruse from JavaScript Toolbox elaborates on the drawbacks of HTML comments in script blocks:

• Hiding Code from XHTML Browsers: HTML comments can prevent code from being rendered in XHTML documents, making it ineffective.
• Invalid Decrement Operations: HTML comments do not allow double dashes (--), which can invalidate decrement operations within scripts.

Alternatives to HTML Comments

Instead of using HTML comments, consider the following alternatives:

• Hide JavaScript code using JavaScript conditional comments
• Use the noscript tag to display fallback content for browsers without JavaScript support

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