jQuery exports a global "scrollLeft" method that is implemented to use window.pageXOffset when that's available and documentElement.scrollLeft otherwise. In RTL situations, pageXOffset in IE behaves like documentElement.scrollLeft in Gecko, Webkit and Opera. https://github.com/jquery/jquery/blob/master/src/offset.js#L148 Mootools and Prototype.js do the same thing: https://github.com/darkwing/mootools-core/blob/master/Source/Element/Element.Dimensions.js#L190 https://github.com/sstephenson/prototype/blob/master/src/prototype/dom/layout.js#L1735 I also found code that adds up scrollLeft values along a chain of DOM ancestors: https://github.com/sstephenson/prototype/blob/master/src/prototype/dom/layout.js#L1129 That obviously would break if scrollLeft sometimes points in different directions. Based on this data, I propose we adopt the Gecko/Opera behavior for both viewport and non-viewport scrolling. (I assume everyone agrees that Webkit treating them differently is a bug.) If we need a property that always starts at 0 and progresses left in RTL situations, I suggest creating a new "scrollHorizontal" property for that. Rob -- “You have heard that it was said, ‘Love your neighbor and hate your enemy.’ But I tell you, love your enemies and pray for those who persecute you, that you may be children of your Father in heaven. ... If you love those who love you, what reward will you get? Are not even the tax collectors doing that? And if you greet only your own people, what are you doing more than others?" [Matthew 5:43-47]
Received on Wednesday, 8 August 2012 21:49:00 UTC