This cheat sheet - or HTML code quick reference - lists the common HTML tags and their attributes, grouped into relevant sections in an easy-to-read format. But sometimes it can puzzling of all the different types of HTML elements there are. It helps search engines evaluate the given content and correctly serve it to its users. For that reason, we’re going to share an HTML cheat sheet that will be useful for all of your web development projects. Published Mar 21, 2019. These elements are universal in that they all use the src attribute to link the source of the content.