2018.3
* Backwards Compatibility Breaking Changes
Web: WWW is now obsolete. Use UnityWebRequest instead.
WebGL: Added asm.js deprecation warning.
WebGL: Enabled WebAssembly traps in Development builds.
WebGL: Removed caching support for compiled WebAssembly module.
WebGL: Unity no longer uses glGetProcAddress internally.
WebGL: WebAssembly is now the default Linker Target on new WebGL projects.
* Improvements
Scripting: Added the status code and name of the error (rather than a generic message) to the error property of UnityWebRequest when it encounters an HTTP error.
Web: UnityWebRequest now supports cookies in the same game session. Added API to remove them.
* API Changes
WebGL: Fixed canvas resize when using Linear color space. (977579)
WebGL: Fixed integer overflow on start-up when Performance Reporting is enabled. (1085302)
WebGL: Fixed mouse input simulation when using touch inputs. (970812)
WebGL: Fixed Unity WebGL content termination. Calling Application.Quit() will stop execution.
WebGL: Fixed WebCamTexture device name (894564)
WebGL: Fixed UnityLoader.js memory leak.
WebGL: Replace usage of deprecated WebAudio gain/playbackRate.value with setValueAtTime() (965647)
WebGL: Replace usage of deprecated WebAudio listener setPosition/setOrientation with position/forward/up.setValueAtTime() (1003912)
WebGL: Workaround for audio not working in Chrome (as of version 66) until the user interacts with the page. (1003917)