isabella232 / breaking-changes-web

💢 A list of breaking changes to the web platform

Breaking Changes to the Web Platform

Over the years there have been necessary changes to the web platform that caused legacy websites to break.

Below is a list of those changes.

• SSL removed in favor of TLS wiki (June 2015)
• Adobe Flash (SWF) End of Life wiki (December 2020)
• <applet>, <blink>, and many other tags removed html5 (January 2008)
• window.showModalDialog removed operablog (August 2014)
• Passive touch listeners by default googleblog (January 2017)
• Forms with passwords marked Not Secure over HTTP googleblog (January 2017)
• Array.prototype.flatten breaks MooTools bugzilla renamed to Array.prototype.flat (May 2018)
• Full page layout is no longer synchronous googleblog (May 2018)
• HTML Imports (part of Web Components v0) deprecated googleblog (October 2018)
• WebSQL is removed developer.apple.com (September 2019)
• Cookies changed from SameSite=None to SameSite=Lax by default chromestatus tweet (August 2020)
• alert() and confirm() removed from cross-origin iframes chromestatus tweet (July 2021)
• Removing HTTP/2 Server Push from Chrome chromeblog (August 2022)