XT Adaptive Images 4: Support of HTML's new responsive image attributes

We have released XT Adaptive Images 4.0. This new major version of the plugin brings with several big news for responsive images generation:

• Adaptive Images, we have rewritten the code to empower the following techniques and implemented unit testing to confirm that it works reliably in all cases. 
• HTML's new responsive image attributes, the new version can generate an image adapted for the screen and declare all the available image sizes in the new srcset and sizes attributes. For more information about the HTML features,  Responsive Images Done Right: A Guide To picture And srcset
• Lazy Load, we have updated the original stable version of the jQuery plugin and added a new Vanilla Lazy Load (beta) alternative, with support of srcset and sizes attributes.
• Compatibility with Joomla 3.8 or superior. Including compatibility with Joomla! 4.

This new major version also embodies a new direction in our development practices, where we manage the process to include unit testing and best coding practices as part of the general methodology to produce high-quality software for desktop and mobile devices.

To the moon!