html - CSS preserve aspect ratio but fill parent div -

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Actually, I have an image that I want to mask with a circle 

 < Code> & lt; Div class = "thumbnail-mask" & gt; & Lt; Img class = "thumbnail-picture" src = "/ image.jpeg" & gt; & Lt; / Div & gt;   
 CSS (I'm using less) is very easy:  
 . Thumbnail-mask {width: @circleSize; Height: @ circle size; Boundary-radius: @ circle size / 2; -Vibit-boundary-radius: @ circle size / 2; -image-radius: @ circle size / 2; Hidden flurry; }   
 I have come to know how both parent parent images stand vertically and horizontally  
 . Thumbnail-pic {text-align: center; Status: Relative; Top: 50%; Webkit-Conversions: Translation Y (-50%); Conversions: Translator Y (-50%); // width: 100%; // height: auto; Height: auto; Width: 100%; }   
 But now the problem is height and width.  
 If I try  height: 100%; Width: 100%;  Aspect ratio changes.  
 If height & gt; Width, then I want  width: 100%; Height: auto;  If width> Height, I want  height: 100%; Width: Auto . In this way, the circle is completely filled. But it does not seem possible I have tried to set the  minimum-width: 100%; Minimum height: 100%  but then without setting height or width, the image is too large.   
 
  
  $ (document) .ready (function ())  
  
 {$ ("Img"). Calculate each function () {// aspect ratio and place it in HTML data-attribute var aspectwrite = $ (this) .wide () / $ (this) .it (); $ (this) .data ( "Aspect ratio", aspect ratio); // conditional statement if (aspect ratio> gt; 1) {// image landscape is $ (this) .css ({height: "100%"})}} If (aspect Ratio & lt; 1) {// Image image is $ (this). CSS ({width: "100%"});}});});   
 Obviously this is not very elegant for pure CSS methods, but it will probably be more reliable.

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