SweetAlert is a new modal dialog box library for JavaScript with a focus on style but without any external dependencies. The developer behind it, Tristan Edwards, created it as a way to ease the pain ...

onclick="alert('hello!'); return false;" /> </form> With the onclick handler in place, the button now opens a JavaScript alert box (saying “hello”). Moreover, because our event-handler definition ...

Edge, for example, offers a checkbox to prevent the page from being able to show subsequent dialogs, and Chrome lets you close the tab in spite of the alert box.