The border-top-left-radius CSS property rounds the top-left corner of an element by specifying the radius [or the radius of the semi-major and semi-minor axes] of the ellipse defining the curvature of the corner.

The rounding can be a circle or an ellipse, or if one of the value is 0, no rounding is done and the corner is square.

[|][//developer.mozilla.org/en-US/docs/Web/CSS/Value%5Fdefinition%5Fsyntax

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With two values:

• the first value is a

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  2 denoting the horizontal semi-major axis of the ellipse to use for the border in that corner.
• the second value is a

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  2 denoting the vertical semi-major axis of the ellipse to use for the border in that corner.

Denotes the size of the circle radius or the semi-major and semi-minor axes of the ellipse. As absolute length it can be expressed in any unit allowed by the CSS

border-top-left-radius = [{1,2}][//developer.mozilla.org/en-US/docs/Web/CSS/Value%5Fdefinition%5Fsyntax

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1 data type. Percentages for the horizontal axis refer to the width of the box, percentages for the vertical axis refer to the height of the box. Negative values are invalid.

Initial value`0`Applies toall elements; but User Agents are not required to apply to

div {
  border-top-left-radius: 40px;
  background-color: lightgreen;
  border: solid 1px black;
  width: 100px;
  height: 100px;
}

0 and

div {
  border-top-left-radius: 40px;
  background-color: lightgreen;
  border: solid 1px black;
  width: 100px;
  height: 100px;
}

1 elements when

div {
  border-top-left-radius: 40px;
  background-color: lightgreen;
  border: solid 1px black;
  width: 100px;
  height: 100px;
}

2 is

div {
  border-top-left-radius: 40px;
  background-color: lightgreen;
  border: solid 1px black;
  width: 100px;
  height: 100px;
}

3. The behavior on internal table elements is undefined for the moment.. It also applies to

div {
  border-top-left-radius: 40px;
  background-color: lightgreen;
  border: solid 1px black;
  width: 100px;
  height: 100px;
}

4.InheritednoPercentagesrefer to the corresponding dimension of the border boxComputed valuetwo absolute

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1s or

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2sAnimation typea , or calc[];

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