This document provides a history of the development of the web from 1991 to the present. It discusses technologies like HTML, HTTP, XMLHttpRequest, AJAX, and mobile web development. It then introduces progressive web apps, which are web applications that are reliable, fast and engaging like native apps through the use of technologies like service workers, web app manifests and push notifications.
![Progressive Web Apps keynote, Google Developer Summit, Tokyo, Japan](https://cdn-ak-scissors.b.st-hatena.com/image/square/87df98a51135bd4b2f8454fe7feb659f45c03551/height=288;version=1;width=512/https%3A%2F%2Fcdn.slidesharecdn.com%2Fss_thumbnails%2Fpwakeynote-introductiontoprogressivewebapps-tokyo-160426055306-thumbnail.jpg%3Fwidth%3D640%26height%3D640%26fit%3Dbounds)