Blitz - WPT: polygon-function-rounding-clamp.html

wpt / css / css-shapes / shape-functions / polygon-function-rounding-clamp.html

/css/css-shapes/shape-functions/polygon-function-rounding-clamp.html

<!DOCTYPE html>
<title>CSS Shapes: polygon() rounding clamping</title>
<link rel="author" title="Jason Leo" href="mailto:cgqaq@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-shapes-1/#funcdef-basic-shape-polygon">
<link rel="match" href="polygon-function-rounding-clamp-ref.html">
<meta name="assert" content="The rounding radius of a polygon() is clamped so it never exceeds tan(angle/2) * segment / 2 for either adjacent line segment.">
<meta name="fuzzy" content="maxDifference=0-35;totalPixels=0-500">
<style>
.test {
    display: inline-block;
    width: 200px;
    height: 200px;
    background: green;
    margin: 10px;
}

/* Rectangle: round 320px, clamped to 100px at 90-degree vertices. */
.t1 {
    clip-path: polygon(round 320px, 0 0, 100% 0, 100% 100%, 0 100%);
}

/* Pentagon: round 320px, overclamped at each vertex. */
.t2 {
    clip-path: polygon(round 320px, 50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
}

/* Isosceles triangle: round 200px, overclamped at each vertex. */
.t3 {
    clip-path: polygon(round 200px, 50% 0%, 0% 100%, 100% 100%);
}

/* Equilateral triangle: round 280px, overclamped at 60-degree vertices. */
.t4 {
    height: auto;
    aspect-ratio: 1 / sin(60deg);
    clip-path: polygon(round 280px, 50% 0%, 0% 100%, 100% 100%);
}

/* Diamond: round 300px, clamped at 90-degree vertices. */
.t5 {
    clip-path: polygon(round 300px, 50% 0%, 100% 50%, 50% 100%, 0% 50%);
}
</style>
<p>The test passes if all five shapes match their references.</p>
<div class="test t1"></div>
<div class="test t2"></div>
<div class="test t3"></div>
<div class="test t4"></div>
<div class="test t5"></div>

/css/css-shapes/shape-functions/polygon-function-rounding-clamp-ref.html

<!DOCTYPE html>
<title>CSS Shapes: polygon() rounding clamping reference</title>
<style>
.test {
    display: inline-block;
    width: 200px;
    height: 200px;
    background: green;
    margin: 10px;
}

/* Rectangle: exact clamped radius = tan(45deg) * 200/2 = 100px. */
.t1 {
    clip-path: polygon(round 100px, 0 0, 100% 0, 100% 100%, 0 100%);
}

/* Pentagon and isosceles triangle: vertices have non-uniform angles, so
   use round 9999px which must clamp to the same max as the test file. */
.t2 {
    clip-path: polygon(round 9999px, 50% 0%, 100% 38%, 82% 100%, 18% 100%, 0% 38%);
}

.t3 {
    clip-path: polygon(round 9999px, 50% 0%, 0% 100%, 100% 100%);
}

/* Equilateral triangle: exact clamped radius = tan(30deg) * 200/2. */
.t4 {
    height: auto;
    aspect-ratio: 1 / sin(60deg);
    clip-path: polygon(round calc(tan(30deg) * 100px), 50% 0%, 0% 100%, 100% 100%);
}

/* Diamond: exact clamped radius = tan(45deg) * 100*sqrt(2)/2 = 50*sqrt(2). */
.t5 {
    clip-path: polygon(round calc(50px * sqrt(2)), 50% 0%, 100% 50%, 50% 100%, 0% 50%);
}
</style>
<p>The test passes if all five shapes match their references.</p>
<div class="test t1"></div>
<div class="test t2"></div>
<div class="test t3"></div>
<div class="test t4"></div>
<div class="test t5"></div>