HTML5 Quick TutorialHTML5 structure HTML5 new features are based on HTML, CSS, DOM, and JavaScript, and reduce the need for external plugins (like Flash). About HTML5 syntax HTML5 syntax is compatible with both HTML4 and XHTML. - You can close the single tag elements (META, BR, HR, INPUT, IMG) with a slash, <tag />, like in XHTML; or you can choose to not add the slash, <tag>. - You can use both lower case, or upper
