diff --git a/changelog.md b/changelog.md
index 6650851..1d02d80 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,8 @@
 ## Changelog
 
+##### v.3.0.7 - 2015-06-29
+* Fixed jumpy behavior in Windows 8.1 mobile. Fixes #239.
+
 ##### v.3.0.6 - 2015-05-19
 * Renamed 'dest' folder to 'dist' to follow common conventions.
 
diff --git a/dist/autosize.js b/dist/autosize.js
index 884c7db..c68bac9 100644
--- a/dist/autosize.js
+++ b/dist/autosize.js
@@ -1,5 +1,5 @@
 /*!
-	Autosize 3.0.5
+	Autosize 3.0.7
 	license: MIT
 	http://www.jacklmoore.com/autosize
 */
@@ -74,7 +74,7 @@
 
 		function update() {
 			var startHeight = ta.style.height;
-			var htmlTop = document.documentElement.scrollTop;
+			var htmlTop = window.pageYOffset;
 			var bodyTop = document.body.scrollTop;
 			var originalHeight = ta.style.height;
 
diff --git a/dist/autosize.min.js b/dist/autosize.min.js
index 3c75299..e4d5f73 100644
--- a/dist/autosize.min.js
+++ b/dist/autosize.min.js
@@ -1,6 +1,6 @@
 /*!
-	Autosize 3.0.5
+	Autosize 3.0.7
 	license: MIT
 	http://www.jacklmoore.com/autosize
 */
-!function(e,t){if("function"==typeof define&&define.amd)define(["exports","module"],t);else if("undefined"!=typeof exports&&"undefined"!=typeof module)t(exports,module);else{var o={exports:{}};t(o.exports,o),e.autosize=o.exports}}(this,function(e,t){"use strict";function o(e){function t(){var t=window.getComputedStyle(e,null);"vertical"===t.resize?e.style.resize="none":"both"===t.resize&&(e.style.resize="horizontal"),l="content-box"===t.boxSizing?-(parseFloat(t.paddingTop)+parseFloat(t.paddingBottom)):parseFloat(t.borderTopWidth)+parseFloat(t.borderBottomWidth),n()}function o(t){var o=e.style.width;e.style.width="0px",e.offsetWidth,e.style.width=o,u=t,a&&(e.style.overflowY=t),n()}function n(){var t=e.style.height,n=document.documentElement.scrollTop,i=document.body.scrollTop,r=e.style.height;e.style.height="auto";var d=e.scrollHeight+l;if(0===e.scrollHeight)return void(e.style.height=r);e.style.height=d+"px",document.documentElement.scrollTop=n,document.body.scrollTop=i;var s=window.getComputedStyle(e,null);if(s.height!==e.style.height){if("visible"!==u)return void o("visible")}else if("hidden"!==u)return void o("hidden");if(t!==e.style.height){var a=document.createEvent("Event");a.initEvent("autosize:resized",!0,!1),e.dispatchEvent(a)}}var i=void 0===arguments[1]?{}:arguments[1],r=i.setOverflowX,d=void 0===r?!0:r,s=i.setOverflowY,a=void 0===s?!0:s;if(e&&e.nodeName&&"TEXTAREA"===e.nodeName&&!e.hasAttribute("data-autosize-on")){var l=null,u="hidden",v=function(t){window.removeEventListener("resize",n),e.removeEventListener("input",n),e.removeEventListener("keyup",n),e.removeAttribute("data-autosize-on"),e.removeEventListener("autosize:destroy",v),Object.keys(t).forEach(function(o){e.style[o]=t[o]})}.bind(e,{height:e.style.height,resize:e.style.resize,overflowY:e.style.overflowY,overflowX:e.style.overflowX,wordWrap:e.style.wordWrap});e.addEventListener("autosize:destroy",v),"onpropertychange"in e&&"oninput"in e&&e.addEventListener("keyup",n),window.addEventListener("resize",n),e.addEventListener("input",n),e.addEventListener("autosize:update",n),e.setAttribute("data-autosize-on",!0),a&&(e.style.overflowY="hidden"),d&&(e.style.overflowX="hidden",e.style.wordWrap="break-word"),t()}}function n(e){if(e&&e.nodeName&&"TEXTAREA"===e.nodeName){var t=document.createEvent("Event");t.initEvent("autosize:destroy",!0,!1),e.dispatchEvent(t)}}function i(e){if(e&&e.nodeName&&"TEXTAREA"===e.nodeName){var t=document.createEvent("Event");t.initEvent("autosize:update",!0,!1),e.dispatchEvent(t)}}var r=null;"undefined"==typeof window||"function"!=typeof window.getComputedStyle?(r=function(e){return e},r.destroy=function(e){return e},r.update=function(e){return e}):(r=function(e,t){return e&&Array.prototype.forEach.call(e.length?e:[e],function(e){return o(e,t)}),e},r.destroy=function(e){return e&&Array.prototype.forEach.call(e.length?e:[e],n),e},r.update=function(e){return e&&Array.prototype.forEach.call(e.length?e:[e],i),e}),t.exports=r});
\ No newline at end of file
+!function(e,t){if("function"==typeof define&&define.amd)define(["exports","module"],t);else if("undefined"!=typeof exports&&"undefined"!=typeof module)t(exports,module);else{var o={exports:{}};t(o.exports,o),e.autosize=o.exports}}(this,function(e,t){"use strict";function o(e){function t(){var t=window.getComputedStyle(e,null);"vertical"===t.resize?e.style.resize="none":"both"===t.resize&&(e.style.resize="horizontal"),l="content-box"===t.boxSizing?-(parseFloat(t.paddingTop)+parseFloat(t.paddingBottom)):parseFloat(t.borderTopWidth)+parseFloat(t.borderBottomWidth),n()}function o(t){var o=e.style.width;e.style.width="0px",e.offsetWidth,e.style.width=o,u=t,a&&(e.style.overflowY=t),n()}function n(){var t=e.style.height,n=window.pageYOffset,i=document.body.scrollTop,r=e.style.height;e.style.height="auto";var d=e.scrollHeight+l;if(0===e.scrollHeight)return void(e.style.height=r);e.style.height=d+"px",document.documentElement.scrollTop=n,document.body.scrollTop=i;var s=window.getComputedStyle(e,null);if(s.height!==e.style.height){if("visible"!==u)return void o("visible")}else if("hidden"!==u)return void o("hidden");if(t!==e.style.height){var a=document.createEvent("Event");a.initEvent("autosize:resized",!0,!1),e.dispatchEvent(a)}}var i=void 0===arguments[1]?{}:arguments[1],r=i.setOverflowX,d=void 0===r?!0:r,s=i.setOverflowY,a=void 0===s?!0:s;if(e&&e.nodeName&&"TEXTAREA"===e.nodeName&&!e.hasAttribute("data-autosize-on")){var l=null,u="hidden",f=function(t){window.removeEventListener("resize",n),e.removeEventListener("input",n),e.removeEventListener("keyup",n),e.removeAttribute("data-autosize-on"),e.removeEventListener("autosize:destroy",f),Object.keys(t).forEach(function(o){e.style[o]=t[o]})}.bind(e,{height:e.style.height,resize:e.style.resize,overflowY:e.style.overflowY,overflowX:e.style.overflowX,wordWrap:e.style.wordWrap});e.addEventListener("autosize:destroy",f),"onpropertychange"in e&&"oninput"in e&&e.addEventListener("keyup",n),window.addEventListener("resize",n),e.addEventListener("input",n),e.addEventListener("autosize:update",n),e.setAttribute("data-autosize-on",!0),a&&(e.style.overflowY="hidden"),d&&(e.style.overflowX="hidden",e.style.wordWrap="break-word"),t()}}function n(e){if(e&&e.nodeName&&"TEXTAREA"===e.nodeName){var t=document.createEvent("Event");t.initEvent("autosize:destroy",!0,!1),e.dispatchEvent(t)}}function i(e){if(e&&e.nodeName&&"TEXTAREA"===e.nodeName){var t=document.createEvent("Event");t.initEvent("autosize:update",!0,!1),e.dispatchEvent(t)}}var r=null;"undefined"==typeof window||"function"!=typeof window.getComputedStyle?(r=function(e){return e},r.destroy=function(e){return e},r.update=function(e){return e}):(r=function(e,t){return e&&Array.prototype.forEach.call(e.length?e:[e],function(e){return o(e,t)}),e},r.destroy=function(e){return e&&Array.prototype.forEach.call(e.length?e:[e],n),e},r.update=function(e){return e&&Array.prototype.forEach.call(e.length?e:[e],i),e}),t.exports=r});
\ No newline at end of file
diff --git a/package.json b/package.json
index 50e6c17..2d46301 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "autosize",
   "description": "Autosize is a small, stand-alone script to automatically adjust textarea height to fit text.",
-  "version": "3.0.6",
+  "version": "3.0.7",
   "keywords": [
     "textarea",
     "form",
diff --git a/src/autosize.js b/src/autosize.js
index 8cd6938..480bef4 100644
--- a/src/autosize.js
+++ b/src/autosize.js
@@ -47,7 +47,7 @@ function assign(ta, {setOverflowX = true, setOverflowY = true} = {}) {
 
 	function update() {
 		const startHeight = ta.style.height;
-		const htmlTop = window.pageYOffset || document.documentElement.scrollTop;
+		const htmlTop = window.pageYOffset;
 		const bodyTop = document.body.scrollTop;
 		const originalHeight = ta.style.height;