⛔️ [DEPRECATED] That is a jquery plugin, which emulates HTML5 Form Validation on old browsers. The plugin also allows to customize form submission validation tooltips and field validation callbacks (e.g. via XMLHttpRequest)
It happens in IE8 on Windows XP and on Chrome 28 on Mac OS X, so I expect it happens everywhere.
As a side note, since this is a polyfill / shim, it probably shouldn't be throwing valid classes and custom markup in Chrome since Chrome supports the required attribute.
You can see this happening on http://demo.dsheiko.com/html5formshim/, by inspecting the first "Name" field.
It happens in IE8 on Windows XP and on Chrome 28 on Mac OS X, so I expect it happens everywhere.
As a side note, since this is a polyfill / shim, it probably shouldn't be throwing valid classes and custom markup in Chrome since Chrome supports the required attribute.