Tools for Web Developers

CSS Flexible Box (Flexbox) Interactive Demo
The flexbox displayed automatically changes as the user selects the various properties.
HTML Elements: All Of Them In One Page
Every possible HTML Element is used in this page. No CSS or JavaScript, just HTML.
HTML Elements Categorized and Listed in a Condensed View
HTML elements categorized and listed in a condensed view with links to the The Web Hypertext Application Technology Working Group (WHATWG) documentation. Vocabulary Browser
Schemas fetched directly from and presented in an easy to navigate hierarchy.
Colors of Material Design for Developers
Google Material Design Pallete Color Selector.
HTML Character Codes Collection
HTML character codes intuitively ordered with optional auto copy to clipboard functionality.
Generate a UTC / UNIX Epoch POSIX timestamp on demand via a friendly easy to use web interface.