• Typical layout demo
• CodePen demo
• Flexbox demo
• As used on Tesco's Food Love Stories
• Codepen: Fluid-responsive property calculator

• Responsive fonts
• Precise control over responsive typography
• Flexible typography with CSS locks
• Viewport sized typography
• Viewport Unit Based Typography
• Fluid Responsive Typography With CSS Poly Fluid Sizing
• Simplified Fluid Typography
• Fluid Typography
• Truly Fluid Typography With VH And VW Units
• Responsive Type and More With Only CSS
• Flexible Type
• Fluid Type
• Viewport Sized Typography
• Responsive Display Text
• Icon based on: Studio Calculator Icon
• Copy to clipboard: Clipboard.js

Update 2021:

• Replaced key detection with KeyboardEvent API to resolve event.which deprecation issues
• Negative values enabled on the range inputs
• Cut & Paste enabled on input fields
• Multi-keyboard types accomodated: Qwerty, Dvorak, Azerty, etc
• Numeric keypad enabled
• Added a comment referencing the tools' url
• A few Accessibility improvements.

Update 2020:

• Variable property name
• CSS clamp option
• CSS min/max option
• Safari resize fix option
• Longhand calculation option
• Settings preserved with localStorage
• Improved HTML form semantics
• Prevention of non-numeric inputs
• Grid and Flexbox layout
• Limited to 4 decimal places.