UWP: How to Save OneNote Selection to HTML File?

Gem Menu for OneNote UWP offer save OneNote selection to a HTML file feature.

Select Some Text in OneNote UWP

At first, select some content in OneNote UWP which you want to save as HTML file.

You can use keyboard shortcut Ctrl+A to select content.
Press Ctrl+A, OneNote UWP will select a paragraph.
Press Ctrl+A again, OneNote UWP will select all content in a container.

Save OneNote UWP Selection to HTML File

Then, click "Gem Menu" -> "Gem" menu -> "Save as" menu item.
It will pop up a "Save as" window to choose where to save the .html file.
Input the file name to save the HTML file.

Demonstration