Add Conditional Styling For Unsupported CSS Features as a css til

Author: jbranchaud

README.md

@@ -9,7 +9,7 @@ and pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://tinyletter.com/jbranchaud).
 
-_887 TILs and counting..._
+_888 TILs and counting..._
 
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@@ -99,6 +99,7 @@ _887 TILs and counting..._
 - [Apply Styles To The Last Child Of A Specific Type](css/apply-styles-to-the-last-child-of-a-specific-type.md)
 - [Change The Orientation Of An Image](css/change-the-orientation-of-an-image.md)
 - [Circular Icons With A Massive Border Radius](css/circular-icons-with-a-massive-border-radius.md)
+- [Conditional Styling For Unsupported CSS Features](css/conditional-styling-for-unsupported-css-features.md)
 - [Create A Pulsing Background With CSS Animation](css/create-a-pulsing-background-with-css-animation.md)
 - [Dry Up SCSS With Mixins](css/dry-up-scss-with-mixins.md)
 - [Give Elements The Same Width With Flexbox](css/give-elements-the-same-width-with-flexbox.md)

css/conditional-styling-for-unsupported-css-features.md

@@ -0,0 +1,32 @@
+# Conditional Styling For Unsupported CSS Features
+
+As much as possible, you should aim to use CSS features that have broad browser
+support. Sometimes browsers lag behind or you'd like to take advantage of a
+draft feature in browsers that support it.
+
+For these situations, you can provide conditional styling using the
+[`@supports`
+at-rule](https://developer.mozilla.org/en-US/docs/Web/CSS/@supports).
+
+Here is an example of conditionally using `display: grid` if it is supported:
+
+```css
+@supports (display: grid) {
+  div {
+    display: grid;
+  }
+}
+```
+
+In [this
+article](https://24ways.org/2019/zs-still-not-dead-baby-zs-still-not-dead/)
+there is an example of using `background-blend-mode` and falling back to
+`background-image` if it isn't supported.
+
+```css
+@supports not (background-blend-mode: normal) {
+  body {
+    background-image: url(fallback.png); 
+  }
+}
+```