The browser does not crop the image. There is nothing to worry about. If you are new to this, I would advise you to use Alts, Title (for SEO - search engine optimization), as well as the size of your images.
<img src="dog.jpg" alt="Image of a dog" title="A dog running happily around" height="42" width="42">
If your image looks cropped, it might be due to your CSS. In Chrome, for example, right-click on the image and select Inspect. Then check the bottom left βStylesβ tab to see if there is any style that affects your image. You can unlock styles to see if one of them makes your image crop. If this is the case, just edit your css accordingly.
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