toastr

Allows detailed control over animations, timeouts, and callbacks, with README examples for showMethod, hideMethod, and easing methods like swing or linear.

Prevents identical toast messages from stacking by setting preventDuplicates to true, matching message content to reduce clutter.

Built-in support for right-to-left languages and a visual progress bar for timeout indication, configurable via options like rtl and progressBar.

Easy to set up with CDN links and minimal code, as shown in the quick start guide with just three steps for basic usage.