Is content loaded/styled/parsed in the tag even when JavaScript is enabled?

Is content loaded/styled/parsed in the tag even when JavaScript is enabled?

For my site, I'm displaying a <div> within a <noscript> tag.
In the DIV, I have an image.
Quick Example:
<noscript>
<img src="logo-sm.png" alt="Site Logo"/>
</noscript>
If JavaScript is enabled, is that image still loaded, and are CSS styles
applied to it? What about DOM event listeners? I'm wondering if a lot of
external content (whether it be images, videos, audios, etc.) will affect
page load for people who actually allow JavaScript beforehand.