Whenever I have Chrome’s console open on stackoverflow and move the mouse over any page elements I see the following line in the console:
event.layerX and event.layerY are broken and deprecated in WebKit. They will be removed from the engine in the near future.
What’s causing this? Is this some sort of heatmap?
It is not stackoverflow.com specfic message, it can come on other sites as well. Message is obvious that in browsers with Webkit engine such as Chrome, Safari those two properties are deprecated.
It seems that these errors come when jQuery is used on a page, jQuery tries to use these two properties.
See this ticket on jQuery bugs where this issue was mentioned:
http://bugs.jquery.com/ticket/10531