Where is the visual studio HTML Designer?

The default HTML editor (for static HTML) doesn't have a design view. To set the default editor to the Web forms editor which does have a design view,

1. Right click any HTML file in the Solution Explorer in Visual Studio and click on Open with
2. Select the HTML (web forms) editor
3. Click on Set as default
4. Click on the OK button

Once you have done that, all you need to do is click on design or split view as shown below:

Another way of setting the default to the HTML web forms editor is:

1. At the top menu in Visual Studio go to File > New > File
2. Select HTML Page
3. In the lower right corner of the New File dialog on the Open button there is a down arrow
4. Click it and you should see an option Open With
5. Select HTML (Web Forms) Editor
6. Click Set as Default
7. Press OK

Go to [Tools, Options], section "Web Forms Designer" and enable the option "Enable Web Forms Designer". That should give you the Design and Split option again.