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HTML reference - HTML | MDN
This HTML reference describes all elements and attributes of HTML, including global attributes that apply to all elements.
HTML element reference
This page lists all the HTML elements, which are created using tags.
HTML attribute reference
Elements in HTML have attributes; these are additional values that configure the elements or adjust their behavior in various ways to meet the criteria the users want.
Global attributes
Global attributes are attributes common to all HTML elements; they can be used on all elements, though they may have no effect on some elements.
Content categories
Every HTML element is a member of one or more content categories — these categories group elements that share common characteristics.
HTML comments are used to add explanatory notes to the markup or to prevent the browser from interpreting specific parts of the document.
Date and time formats used in HTML
Certain HTML elements allow you to specify dates and/or times as the value or as the value of an attribute. These include the date and time variations of the <input><ins><del>
