lib/Ext/dom/Element.style.js
function(prop) {
        //<debug warn>
        Ext.Logger.deprecate("Ext.dom.Element.isTransparent() is deprecated", this);
        //</debug>

        var value = this.getStyle(prop);

        return value ? this.transparentRe.test(value) : false;
    }
function(prop) {
        //<debug warn>
        Ext.Logger.deprecate("Ext.dom.Element.isTransparent() is deprecated", this);
        //</debug>

        var value = this.getStyle(prop);

        return value ? this.transparentRe.test(value) : false;
    }
Returns `true` if the value of the given property is visually transparent. This
may be due to a 'transparent' style value or an rgba value with 0 in the alpha
component.
@deprecated 2.0.0
@param {String} prop The style property whose value is to be tested.
@return {Boolean} `true` if the style property is visually transparent.