Can I use CSS Variables in IE11 without native support?

IE11: CSS Variables Polyfill

Question:

Can I use CSS variables in IE11 without native support?

Answer:

Yes, using the CSS Vars Ponyfill.

The CSS Vars Ponyfill is a client-side JavaScript library that transforms CSS custom properties into static values, enabling IE11 browsers to support CSS variables. It offers features such as:

• Live updates of runtime values
• Transformation of link, style, and @import CSS
• Support for chained and nested var() functions
• Integration with web components and shadow DOM

Usage:

Include the ponyfill in your web page:

<script src="https://unpkg.com/css-vars-ponyfill/dist/css-vars-ponyfill.js"></script>

Limitations:

• Custom property support is limited to :root and :host declarations.
• var() usage is restricted to property values.

Examples:

:root {
  --color: red;
}

p {
  color: var(--color);
}

:root {
  --size: 1em;
  --multiplier: 2;
}

p {
  font-size: calc(var(--size) * var(--multiplier));
}

W3C Specifications:

• [CSS Custom Properties](https://www.w3.org/TR/css-variables-1/)
• [CSS Cascading and Inheritance Level 4](https://www.w3.org/TR/css-cascade-4/#cascade-order)

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