- Even if a browser does have the desired scripting language available, content inside the <noscript> tag is downloaded to the browser. It is available to the DOM; but is simply not rendered. Assets such as Flash files and images are not downloaded by the browser.
- Moving content inside the <noscript> tag can affect SEO. Most search engines do not index <noscript> tag. Even those that do index <noscript> content do not give it as much weight as "plain" content.