Open LabVIEW and select "Find Examples" from the Help menu. Select the search tab and type in HTML in the search box...you will now find examples on how to generate reports in HTML including control and indicator graphics and much more...
Or just select Print from the File menu...you can then select what you want to print and you can choose to print it as HTML.
If you just need to get the picture of a control and save it as a picture that you can refer to in a HTML document wire a reference to the control to an invoke node and select the Get Image Method...the data you get from that can be saved using e.g. the write .bmp or .jpg functions.
OR if you want the page to contain live data use the Web Publishing Tool from the tools menu...