Google-drive – No option to import documents into Google Docs

use Office Compatibility Mode (OCM)

Taken from Save, edit & share Microsoft Office files, specifically from the following section:

You can use Microsoft Office files in Google Drive in three ways on your computer:

• From web browsers or with sync clients
• Use the plugin with your Microsoft Office programs
• Upload your files to drive.google.com and use Office Compatibility Mode (OCM)

To sync files directly from your computer to Google Drive, download Google Drive for Mac or PC.

NOTE: The supported features of OCM are very limited.

When you have an HTML file in Google Drive and ask to open it with Google Docs, there's no 'convert' option AFAICT and you get a 'view source' sort of view instead of seeing it rendered.

If you have the HTML file saved locally and you upload from the Google Docs page itself, there is a 'convert' option in the upload dialog, and that will produce a rendered version of the page. In my limited experience with that conversion step (importing some HTML produced by the ASCIIDoc formatter), the rendered HTML didn't look very good -- it came out with an awful-looking font and lost some formatting from the original HTML.

The top-rated Google search results for importing HTML into Google Docs all seem to assume you're importing HTML data into a spreadsheet.

So while it seems to be possible to get some kind of rendered HTML by going through one specific path, this doesn't appear to be a high priority for Google Docs.