object-fit polyfill only for images in IE. Every other browsers (Chrome, Safari, Firefox, Opera, Edge) supported 'object-fit' property. It help to fit the image into the containers.

It support from version 9. Below 9, still in progress.

objectFitIE.ieImg('image-wrapper-class-name', 'object-position x', 'object-position y', 'object-fit');

1. image-wrapper-class-name - place your wrapper class name here. see the example below -

<div class='wrapper-name'>
  <img src='' alt=''>
 </div>

It will target the class wrapper-name. Make sure, within the wrapper only one image will be there.

2. object-position x and object-position y - place the values for x and y axis. just like the object-position in css.
3. object-fit - place the object-fit value just like you put it in css.

1. create the wrapper of the image where you want to apply object-fit property.
2. include the object-fit-ie.js file in your codebase.
3. call this before </body> -

objectFitIE.ieImg('image-wrapper-class-name', 'object-position x', 'object-position y', 'object-fit');

4. and see it in IE browser.