I want to download as an HTML file.

If you want to download the product detail page or a listing page HTML file, you can select only that part using Listly Part+.

First, go to the website you want to extract from, then open the Listly extension.

After that, select the detail page with Part+, then click HTML Source in the EXTRACT section.

The extracted contents are saved to the data board as an HTML file like this.