MessageDialog for WebApp ?

Hi folks,

I’m sort of rewriting one desktop app for a web app.
I use the MessageDialog module to get the system icons for note,caution,stop alerts.
and this is not available for web app
is there an alternative to get these icons in a web app (of course mac win and linux…)

thanks.
ps: I would like to avoid plugins as always…

Edit: seeing this 2013 thread is not encouraging !
https://forum.xojo.com/5605-we-messagedialog

Use a webdialog box with an icon in a webimageview, a weblabel and webbutton.