Input HTML Show outline > Parse as XML That means you can have a complex heading hierarchy within a blockquote without worrying how it will affect the overall structure of the document. 3.2.1.3 Historical Notes. The html, head, and body elements have been part of the HTML specification since the mid 1990s, and up until a few years ago they were the primary elements used to give structure to HTML documents. HTML5 outliner service. The latest W3C HTML specs only use the document outline algorithm to suggest how authors should synchronize their numbered heading tags with their nested sectioning elements. The Chrome HTML5 document outline extension is now used (somewhat) constantly throughout my frontend dev process. Headings in a Sectioning Root element will not be included in the main document outline. If you want to write semantic markup – and believe us, you do want to write semantic markup – then you need to structure HTML documents properly. This section needs revising and may be moved to an external document and simply referred to. In one of my previous articles, Using Heading Elements to Create a Document Outline, I explained the importance of having valid outlines in an HTML page. HTML5 Outliner Navigation Home > HTML5 Outliner. Prior to HTML5 that was pretty much the only way that we could generate a document outline. It is available as a Chrome extension, a Bookmarklet (Limited version for IE), a very early experimental Firebug extension, and as a minified JavaScript. To help you get your document outline right, there is an implementation of the W3C's Outliner algorithm in the HTML5 outliner (h5o) at Github. . (Disclaimer: 'document outline' is not an HTML5 thing, but I can't imagine many people who care about such things haven't started using 'HTMl5… You can also edit the HTML or CSS on-the-fly in the Elements or Styles panel that opens. This is useful for user agents, who can use the outline to create, for example, a table of contents for the document. This is a front-end for my implementation of the HTML outline algorithm. "[html]": {"editor.foldingStrategy": "indentation"}, Formatting. If I tested this online in the outliner you can see it gives us the same type of outline. Perfect. Go check out your document outlines now! The WHATWG HTML specs still have the full outline algorithm described as a normative requirement, although there is an open issue where many suggest removing it altogether. To make sure about this answer, please test following html snippet, you will see the same result: There is also a bookmarklet available here. And one of the reasons why it was so important to have a specific sitewide strategy, in how headings are applied to elements. To improve the formatting of your HTML source code, you can use the Format Document command ⇧⌥F (Windows Shift+Alt+F, Linux Ctrl+Shift+I) to format the entire file or Format Selection ⌘K ⌘F (Windows, Linux … You can read the updated advice and requirements in the HTML 5.1 specification. The simple reason for this change is that the HTML5 document outline is not implemented and despite efforts to get it implemented, the general response from user agent developers has not been enthusiastic. The outline for an HTML document shows the structure of the content on the page. Inspect an HTML Element: Right-click on an element (or a blank area), and choose "Inspect" or "Inspect Element" to see what elements are made up of (you will see both the HTML and the CSS). 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