# Bad start tag in “iframe” in “noscript” in “head”. > Canonical HTML version: https://rocketvalidator.com/html-validation/bad-start-tag-in-iframe-in-noscript-in-head > Attribution: Rocket Validator (https://rocketvalidator.com) > License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) The `

`, and `<meta>` elements — strictly metadata content. When placed inside the `<body>`, it can contain any flow content, including `<p>`, `<div>`, `<iframe>`, and more. This distinction is defined in the [WHATWG HTML Living Standard](https://html.spec.whatwg.org/multipage/scripting.html#the-noscript-element). When the validator encounters an `<iframe>` inside a `<noscript>` in the `<head>`, it reports "Bad start tag" because the parser is operating under the `<head>` content model, where `<iframe>` is simply not a valid element. The browser may attempt error recovery by implicitly closing the `<head>` and opening the `<body>`, but this can lead to unexpected DOM structures and layout issues. This pattern commonly appears when adding tracking or analytics snippets. For instance, Google Tag Manager provides a `<noscript>` fallback containing an `<iframe>`, and it's meant to be placed immediately after the opening `<body>` tag — not in the `<head>`. Placing it in the wrong location breaks validation and may cause the tracking pixel to malfunction. To fix the error, identify any `<noscript>` blocks in your `<head>` that contain non-metadata elements (like `<iframe>`, `<p>`, `<div>`, `<img>`, etc.) and move them into the `<body>`. If the `<noscript>` block only needs metadata elements like `<meta>` or `<style>`, it can remain in the `<head>`. ## Examples ### Invalid: `iframe` inside `noscript` in `head` The `<iframe>` is not valid metadata content, so it cannot appear inside `<noscript>` within the `<head>`. ```html <!DOCTYPE html> <html lang="en"> <head> <title>My webpage</title> <noscript> <iframe src="https://example.com/tracking"></iframe>

Welcome

``` ### Fixed: `noscript` with `iframe` moved to `body` Moving the `

My webpage <iframe src="https://example.com/tracking"></iframe>

Welcome

``` ### Valid: metadata-only `noscript` in `head` A `

My webpage <meta http-equiv="refresh" content="0; url=https://example.com/nojs"> <style> .js-only { display: none; } </style>

Welcome

``` ### Fixed: splitting a mixed `noscript` between `head` and `body` If you need both metadata and flow content in your `

` blocks — one in the `<head>` for metadata, and one in the `<body>` for visible content. ```html <!DOCTYPE html> <html lang="en"> <head> <title>My webpage</title> <noscript> <style> .js-only { display: none; } </style>

Welcome

```