qt5base-lts/examples/webkit/webkit-guide/css/css3_mask-img.css

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body {
    font-family             : sans-serif;
    background              : #333333;
}

h1,h2,h3,h4 {
    text-align              : center;
}

img {
    position                : absolute;
    left                    : 5%;
    top                     : 5%;
    height                  : 90%;
    width                   : 90%;
    -webkit-mask-box-image  : url(../img/mask.png) 5% stretch;
}