HTML5

Generally refers to pages on a website designed with one specific purpose in mind, usually related to capturing a lead or sale.

Best practices for landing pages include minimizing ancillary information so that there is only one, prominent option for action by a user. This helps focus their attention and can lead to increased lead generation.

The number of times an ad is clicked compared to the number of impressions it has. Stated differently, clickthrough rate is the ratio of views to clicks. Monitoring clickthrough rates on digital ad campaigns and email sends, for example, can lead to insights that will improve future campaigns.

A Viewport is the visible area of a webpage. The viewport for a mobile device will be smaller than a desktop screen, and there is considerable variance within device types as well.

Websites need to be responsive to account for differing viewport sizes to avoid massive visual errors and user frustration, which is why responsive web design is so important.