I am trying to create certificates on html webpages. Normally, though not all the time, certificates are landscape/horizontal. How can I create a landscape certificate on an html webpage without the viewer having to change the printer settings to landscape? Is there an html code that automatically places images/texts on its side whether right or left or do I have no choice but to make the certificates vertical? This isn't a problem for me. I just would like to know my options before I begin creating these certificates. Thanks.

HTML has no way of affecting the printer setting. (neither has javascript)

You could try making a print stylesheet for the layout, but avoid using floats and absolute positioning in it.

Why not simply create the certificates as pdf files so the user can download and print them.

Thank you so much for your response. I decided to stay with the vertical certificate style. Trying to go landscape sounds like it is more work than it is worth.