define( [

"../core",
"../var/rcssNum"

], function( jQuery, rcssNum ) {

“use strict”;

function adjustCSS( elem, prop, valueParts, tween ) {

var adjusted, scale,
        maxIterations = 20,
        currentValue = tween ?
                function() {
                        return tween.cur();
                } :
                function() {
                        return jQuery.css( elem, prop, "" );
                },
        initial = currentValue(),
        unit = valueParts && valueParts[ 3 ] || ( jQuery.cssNumber[ prop ] ? "" : "px" ),

        // Starting value computation is required for potential unit mismatches
        initialInUnit = ( jQuery.cssNumber[ prop ] || unit !== "px" && +initial ) &&
                rcssNum.exec( jQuery.css( elem, prop ) );

if ( initialInUnit && initialInUnit[ 3 ] !== unit ) {

        // Support: Firefox <=54
        // Halve the iteration target value to prevent interference from CSS upper bounds (gh-2144)
        initial = initial / 2;

        // Trust units reported by jQuery.css
        unit = unit || initialInUnit[ 3 ];

        // Iteratively approximate from a nonzero starting point
        initialInUnit = +initial || 1;

        while ( maxIterations-- ) {

                // Evaluate and update our best guess (doubling guesses that zero out).
                // Finish if the scale equals or crosses 1 (making the old*new product non-positive).
                jQuery.style( elem, prop, initialInUnit + unit );
                if ( ( 1 - scale ) * ( 1 - ( scale = currentValue() / initial || 0.5 ) ) <= 0 ) {
                        maxIterations = 0;
                }
                initialInUnit = initialInUnit / scale;

        }

        initialInUnit = initialInUnit * 2;
        jQuery.style( elem, prop, initialInUnit + unit );

        // Make sure we update the tween properties later on
        valueParts = valueParts || [];
}

if ( valueParts ) {
        initialInUnit = +initialInUnit || +initial || 0;

        // Apply relative offset (+=/-=) if specified
        adjusted = valueParts[ 1 ] ?
                initialInUnit + ( valueParts[ 1 ] + 1 ) * valueParts[ 2 ] :
                +valueParts[ 2 ];
        if ( tween ) {
                tween.unit = unit;
                tween.start = initialInUnit;
                tween.end = adjusted;
        }
}
return adjusted;

}

return adjustCSS; } );