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)
  • 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)