11. Whats new in HTML 5.1?

HTML5.1 is the new recommandation from W3C on 1 November 2016. It comes with new features, changes and improvments to existing HTML5.

New Elements

<menu> & <menuitem>
<details> & <summary>
<picture>
<dialog>

New Input Elements

<input type="month">
<input type="week">
<input type="datetime-local">

New Attributes

context for <menu type="context">
srcset for <img srcset="">
nonce within <script nonce> & <style nonce>
noopener for <a target="_blank" rel="noopener"> & <area rel="noopener">
allowfullscreen for <iframe>

Removed Features

appCache
command API
multiple attribute in <input type="range">

Some More removed features.

New Pseudo Classes

:dir(ltr|rtl)

New API's

onrejectionhandled & onunhandledrejection to track promise rejection
forceSpellCheck

Changes To Existing Features

window.open() method can return null
<img> tag now supports width="0"
mousewheel event is now called wheel
<option> can be empty
<figcaption> can appear anywhere within <figure>
rev attribute for links to support RDFa
<header> & <footer> can be nested within section containing

Some more changes features.

Reference

W3C recommendation HTML 5.1
nonce for CSP