One of the design goals for HTML5 is to support for multimedia on mobile devices. More and more of the web’s legacy sites are switching to this markup language due to its functionality and ability to create responsive web design, and HTML5’s involvement in new sites. New syntactic features were introduced to support this, such as video, audio and canvas tags.
HTML5 also introduces new features which can really change the way users interact with documents. Web developers or designers can operate effectively with good HTML5 tools. Here are the list of 20 HTML5 Tools for Designers & Developers
Sublime Text may be downloaded and evaluated for free, however a $70 license
This is a good free WYSIWYG content editor for HTML5
Adobe Dreamweaver is the most used HTML and powerful authoring tool for responsive website design.
One of the simplest solutions for HTML5 coding is Google Chrome console.
Moqups is an HTML5 tools for designers to create wireframes for web & mobile.