Adds alternative check to scrollTop

readme.md

@@ -1,39 +1,39 @@
-## Summary
-
-Autosize is a small, stand-alone script to automatically adjust textarea height to fit text.
-
-#### Demo
-
-Full documentation and a demo can be found at [jacklmoore.com/autosize](http://jacklmoore.com/autosize)
-
-#### Install via NPM
-```bash
-npm install autosize
-```
-#### Install via Bower
-```bash
-bower install autosize
-```
-
-#### Browser compatibility
-
-Chrome | Firefox | IE | Safari | iOS Safari | Android | Opera Mini
------- | --------|----|--------|------------|---------|------------
-yes    | yes     | 9  | yes    | yes        | 4       | ?
-
-#### Usage
-
-The autosize function accepts a single textarea element, or an array or array-like object (such as a NodeList or jQuery collection) of textarea elements.
-
-```javascript
-// from a NodeList
-autosize(document.querySelectorAll('textarea'));
-
-// from a single Node
-autosize(document.querySelector('textarea'));
-
-// from a jQuery collection
-autosize($('textarea'));
-```
-
-Released under the [MIT License](http://www.opensource.org/licenses/mit-license.php)
+## Summary
+
+Autosize is a small, stand-alone script to automatically adjust textarea height to fit text.
+
+#### Demo
+
+Full documentation and a demo can be found at [jacklmoore.com/autosize](http://jacklmoore.com/autosize)
+
+#### Install via NPM
+```bash
+npm install autosize
+```
+#### Install via Bower
+```bash
+bower install autosize
+```
+
+#### Browser compatibility
+
+Chrome | Firefox | IE | Safari | iOS Safari | Android | Opera Mini | Windows Phone IE
+------ | --------|----|--------|------------|---------|------------|------------------
+yes    | yes     | 9  | yes    | yes        | 4       | ?          | 8.1
+
+#### Usage
+
+The autosize function accepts a single textarea element, or an array or array-like object (such as a NodeList or jQuery collection) of textarea elements.
+
+```javascript
+// from a NodeList
+autosize(document.querySelectorAll('textarea'));
+
+// from a single Node
+autosize(document.querySelector('textarea'));
+
+// from a jQuery collection
+autosize($('textarea'));
+```
+
+Released under the [MIT License](http://www.opensource.org/licenses/mit-license.php)

src/autosize.js

@@ -47,7 +47,7 @@ function assign(ta, {setOverflowX = true, setOverflowY = true} = {}) {
 
 	function update() {
 		const startHeight = ta.style.height;
-		const htmlTop = document.documentElement.scrollTop;
+		const htmlTop = window.pageYOffset || document.documentElement.scrollTop;
 		const bodyTop = document.body.scrollTop;
 		const originalHeight = ta.style.height;
 
@@ -119,7 +119,7 @@ function assign(ta, {setOverflowX = true, setOverflowY = true} = {}) {
 	ta.addEventListener('input', update);
 	ta.addEventListener('autosize:update', update);
 	ta.setAttribute('data-autosize-on', true);
-	
+
 	if (setOverflowY) {
 		ta.style.overflowY = 'hidden';
 	}
@@ -173,4 +173,4 @@ if (typeof window === 'undefined' || typeof window.getComputedStyle !== 'functio
 	};
 }
 
-export default autosize;
+export default autosize;