The HTML5 client was introduced in VMware vSphere 6.5 and it evolved significantly between that and VMware vSphere 6.7. vSphere 6.7 U1 was released on October 27, 2018, and, according to the enhancement list, the HTML5 interface now supports all the functions available in the FLEX client.
The new client, called vSphere Client (in this book, we will call it the HTML5 client to clarify the type of client), comes from the vSphere HTML5 Web Client Flings project (https://labs.vmware.com/flings/vsphere-html5-web-client). This client is still available if you want to add this functionality to a vSphere 6.0 infrastructure. With the release of vSphere 6.7, the reach of the HTML5 client development increased, covering 95% of the workflow.
The new client is entirely built on HTML5. It requires no plugins and is lighter and much faster than the flash...