"autofocus" attribute for form elements not honoured

I'm having a web app, which auto-focuses an input text field on page load (non-javascript, native "autofocus" html attr).
When using the site via NativeAlpha, the autofocus attr does not seem to be honoured.
At least in my case the input field is not focused when opened via NativeAlpha.

Example site: https://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_input_autofocus