Function defaultPrefilter

2.0.3/2.0.3.js:8233–8354

( elem, props, opts )

    });

    function defaultPrefilter( elem, props, opts ) {
        /* jshint validthis: true */
        var prop, value, toggle, tween, hooks, oldfire,
            anim = this,
            orig = {},
            style = elem.style,
            hidden = elem.nodeType && isHidden( elem ),
            dataShow = data_priv.get( elem, "fxshow" );

        // handle queue: false promises
        if ( !opts.queue ) {
            hooks = jQuery._queueHooks( elem, "fx" );
            if ( hooks.unqueued == null ) {
                hooks.unqueued = 0;
                oldfire = hooks.empty.fire;
                hooks.empty.fire = function() {
                    if ( !hooks.unqueued ) {
                        oldfire();
                    }
                };
            }
            hooks.unqueued++;

            anim.always(function() {
                // doing this makes sure that the complete handler will be called
                // before this completes
                anim.always(function() {
                    hooks.unqueued--;
                    if ( !jQuery.queue( elem, "fx" ).length ) {
                        hooks.empty.fire();
                    }
                });
            });
        }

        // height/width overflow pass
        if ( elem.nodeType === 1 && ( "height" in props || "width" in props ) ) {
            // Make sure that nothing sneaks out
            // Record all 3 overflow attributes because IE9-10 do not
            // change the overflow attribute when overflowX and
            // overflowY are set to the same value
            opts.overflow = [ style.overflow, style.overflowX, style.overflowY ];

            // Set display property to inline-block for height/width
            // animations on inline elements that are having width/height animated
            if ( jQuery.css( elem, "display" ) === "inline" &&
                jQuery.css( elem, "float" ) === "none" ) {

                style.display = "inline-block";
            }
        }

        if ( opts.overflow ) {
            style.overflow = "hidden";
            anim.always(function() {
                style.overflow = opts.overflow[ 0 ];
                style.overflowX = opts.overflow[ 1 ];
                style.overflowY = opts.overflow[ 2 ];