A few of our tools are: CSS Validator, CSS Font Preview and our new CSS Playground (external site) where you can show off your CSS skills. Actually, this version adds the ability to slide the range knob by using the HTML5′s range input element. So we can add buttons that move the slider unit at a time. CSS Range Slider With HTML & JavaScript Source Code. Input Type Range Slider Plugin for WordPress. Progress bar Add a progress bar for. CSS Button Generator. These color codes can be used to define colors in HTML, CSS and/or Javascript which, of course, includes the HTML font element. The Slider can optionally show tick marks and labels indicating the different slider position values.