diff --git a/webpack.config.js b/webpack.config.js
index 7c561bf..a542163 100755
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -180,7 +180,9 @@ function getCSSWhitelistPatterns() {
     /^figure$/,
     /^blockquote$/,
     /^tsml(-.*)?$/,
+    /^is-active$/,
     /^collapse$/,
+    /^collapsed$/,
     /^collapsing$/,
     /^label$/,
     /^input$/,