Most actions performed by a pointing device such as a mouse can be done from a keyboard like clicking and selecting text. However there are a few tasks that can't be done from a keyboard such as free hand drawing, painting, and or games that require eye hand coordination from a pointing device.
When designing your site, try to be mindful to test the user experience from the perspective of someone relying solely on the use of the keyboard to engage and interact with your site.
However, the average website does not have the need for this type of keyboard functionality (e.g. free hand drawing), so most likely your website meets this standard.