Workaround for CSS variables in IE?

Question

I\'m currently developing a web application in Outsystems in which I have the need to customize the CSS, in which I\'m using variables. I need to guarantee the app works cro

Answer 1

In case someone comes across this, has a similar issue where I had it set like this.

a {
  background: var(--new-color);
  border-radius: 50%;
}

I added the background colour before the variable so if that didn't load it fell back on the hex.

a {
  background: #3279B8;
  background: var(--new-color);
  border-radius: 50%;
}

Answer 2

Yes there is a way, the same way you make any css compatible: use a specific css fallback that is supported by the browser.

body {
  --text-color: red;
}

body {
  color: red; /* default supported fallback style */
  color: var(--text-color); /* will not be used by any browser that doesn't support it, and will default to the previous fallback */
}

This solution is incredibly redundant and 'almost' defeats the purpose of css variables....BUT it is necessary for browser compatibility. Doing this would essentially make the css variables useless but I implore you to still use them because it will serve as an important reminder to the fact that these values are referenced elsewhere and need to be updated in all cases, otherwise you forget to update every related occurrence of 'color' and then you have inconsistent styling because relevant css values are out of sync. The variable will serve more as a comment but a very important one.

Answer 3

There is a polyfill, which enables almost complete support for CSS variables in IE11:
https://github.com/nuxodin/ie11CustomProperties
(i am the author)

The script makes use of the fact that IE has minimal custom properties support where properties can be defined and read out with the cascade in mind.
.myEl {-ie-test:'aaa'} // only one dash allowed! "-"
then read it in javascript:
getComputedStyle( querySelector('.myEl') )['-ie-test']

From the README:

Features

• handles dynamic added html-content
• handles dynamic added , -elements
• chaining --bar:var(--foo)
• fallback var(--color, blue)
• :focus, :target, :hover
• js-integration:
  • style.setProperty('--x','y')
  • style.getPropertyValue('--x')
  • getComputedStyle(el).getPropertyValue('--inherited')
• Inline styles: <div ie-style="--color:blue"...
• cascade works
• inheritance works
• under 3k (min+gzip) and dependency-free

Demo:

https://rawcdn.githack.com/nuxodin/ie11CustomProperties/b851ec2b6b8e336a78857b570d9c12a8526c9a91/test.html

Answer 4

Make a seperate .css file for your variables. Copy/paste the contents of the variable.css file to the end of your main.css file. Find and replace all the variable names in the main.css file to the hex code for those variables. For example: ctrl-h to find var(--myWhiteVariable) and replace with #111111.

Side note: if you keep the :root{ } in the main.css file and just comment it out, you can use that to track those hex codes later if you want to update your fallback colors.