diff --git a/packages/core-js/internals/engine-is-webos-webkit.js b/packages/core-js/internals/engine-is-webos-webkit.js
new file mode 100644
index 000000000000..7c67ab0abd29
--- /dev/null
+++ b/packages/core-js/internals/engine-is-webos-webkit.js
@@ -0,0 +1,3 @@
+var userAgent = require('../internals/engine-user-agent');
+
+module.exports = /web0s(?!.*chrome)/i.test(userAgent);
diff --git a/packages/core-js/internals/microtask.js b/packages/core-js/internals/microtask.js
index 2da2c24a46ed..b7c1e6ef4eda 100644
--- a/packages/core-js/internals/microtask.js
+++ b/packages/core-js/internals/microtask.js
@@ -2,6 +2,7 @@ var global = require('../internals/global');
 var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
 var macrotask = require('../internals/task').set;
 var IS_IOS = require('../internals/engine-is-ios');
+var IS_WEBOS_WEBKIT = require('../internals/engine-is-webos-webkit');
 var IS_NODE = require('../internals/engine-is-node');
 
 var MutationObserver = global.MutationObserver || global.WebKitMutationObserver;
@@ -34,7 +35,8 @@ if (!queueMicrotask) {
   };
 
   // browsers with MutationObserver, except iOS - https://github.com/zloirock/core-js/issues/339
-  if (!IS_IOS && !IS_NODE && MutationObserver && document) {
+  // also except WebOS Webkit https://github.com/zloirock/core-js/issues/898
+  if (!IS_IOS && !IS_NODE && !IS_WEBOS_WEBKIT && MutationObserver && document) {
     toggle = true;
     node = document.createTextNode('');
     new MutationObserver(flush).observe(node, { characterData: true });