CSS property: border-top-left-radius


The top left border radius

The two length or percentage values of the border-top-left-radius properties define the radii of a quarter ellipse that defines the shape of the corner of the outer border edge. The first value is the horizontal radius, the second the vertical radius. If the second value is omitted it is copied from the first. If either length is zero, the corner is square, not rounded. Percentages for the horizontal radius refer to the width of the border box, whereas percentages for the vertical radius refer to the height of the border box.


border-top-left-radius: [ <length> | <percentage> ] [ <length> | <percentage> ]?




h1 {
    background-color: #f00;
    border-top-left-radius: 10px;