An h:commandLink uses two ace:animation tags to chain two animations. This commandLink is used to close an ace:dialog. When the link is clicked in IE8, a JavaScript error is thrown:

Unable to get value of the property '0': object is null or undefined

This is from the bundled JQuery JavaScript.

Sample code:
                            <h:commandLink id="closeEffect"
                                           value="close with effect">
                                <f:ajax execute="@this"
                                        render="popDetails"
                                        event="click"
                                        listener="#{TestBean.setDialogVisible(false)}"/>
                                <ace:animation event="click"
                                               name="fade"/>
                                <ace:animation event="click"
                                               name="highlight"/>
                            </h:commandLink>