How to auto resize pictures images using CSS

example

img   {
  max-width: 550px;
         width: expression(this.width > 550 ? 550: true);
         max-height: 400px;
         height: expression(this.height > 400 ? 400: true);

}

secon solution example

.resize {
width: 200px;
height : auto;
}

.resize {
width: auto;
height : 300px;
}

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