You might have been unlucky searching for the a element that's really short. And very basic HTML would work everywhere.
But you might be more happy to go via the feature list: https://www.caniemail.com/features/
LOL ok that was just a really unfortunate coincidence. I used the <a> tag because I knew it would/should be supported everywhere so wanted to test the website with an input where I know what response to expect :)
