ellipse() CSS-Funktion

clip-path: ellipse(20px 50px);

clip-path: ellipse(4rem 50% at right center);

clip-path: ellipse(closest-side closest-side at 5rem 6rem);

clip-path: ellipse(closest-side farthest-side);

clip-path: ellipse(closest-corner closest-corner at 25% 25%);

clip-path: ellipse(closest-side closest-corner at 25% 25%);

clip-path: ellipse(closest-side farthest-corner at 25% 25%);

<section class="default-example" id="default-example">
  <div class="transition-all" id="example-element"></div>
</section>

#default-example {
  background: #ffee99;
}

#example-element {
  background: linear-gradient(to bottom right, #ff5522, #0055ff);
  width: 100%;
  height: 100%;
}

shape-outside: ellipse(40% 50% at left);
shape-outside: ellipse(closest-side farthest-side at 30%);
border-shape: ellipse(50% 40%);

<div class="box">
  <div class="shape"></div>
  <p>
    One November night in the year 1782, so the story runs, two brothers sat
    over their winter fire in the little French town of Annonay, watching the
    grey smoke-wreaths from the hearth curl up the wide chimney. Their names
    were Stephen and Joseph Montgolfier, they were papermakers by trade, and
    were noted as possessing thoughtful minds and a deep interest in all
    scientific knowledge and new discovery. Before that night—a memorable night,
    as it was to prove—hundreds of millions of people had watched the rising
    smoke-wreaths of their fires without drawing any special inspiration from
    the fact.
  </p>
</div>

body {
  font: 1.2em / 1.5 sans-serif;
}
.shape {
  float: left;
  shape-outside: ellipse(40% 50% at left);
  margin: 20px;
  width: 100px;
  height: 200px;
}

<div class="box">
  <div class="shape"></div>
  <p>
    One November night in the year 1782, so the story runs, two brothers sat
    over their winter fire in the little French town of Annonay, watching the
    grey smoke-wreaths from the hearth curl up the wide chimney. Their names
    were Stephen and Joseph Montgolfier, they were papermakers by trade, and
    were noted as possessing thoughtful minds and a deep interest in all
    scientific knowledge and new discovery. Before that night—a memorable night,
    as it was to prove—hundreds of millions of people had watched the rising
    smoke-wreaths of their fires without drawing any special inspiration from
    the fact.
  </p>
</div>

body {
  font: 1.2em / 1.5 sans-serif;
}
.shape {
  float: left;
  shape-outside: ellipse(closest-side farthest-side at 30%);
  margin: 20px;
  width: 100px;
  height: 140px;
}

<div class="controls">
  <div class="controls-row">
    <label>
      X radius:
      <select id="radius-x-keyword">
        <option value="closest-side">closest-side</option>
        <option value="closest-corner">closest-corner</option>
        <option value="farthest-side">farthest-side</option>
        <option value="farthest-corner" selected>farthest-corner</option>
      </select>
    </label>
    <label>
      Y radius:
      <select id="radius-y-keyword">
        <option value="closest-side">closest-side</option>
        <option value="closest-corner">closest-corner</option>
        <option value="farthest-side" selected>farthest-side</option>
        <option value="farthest-corner">farthest-corner</option>
      </select>
    </label>
  </div>
  <div class="controls-row">
    <label>
      Position X:
      <input type="range" id="pos-x" min="0" max="200" value="120" />
    </label>
    <label>
      Position Y:
      <input type="range" id="pos-y" min="0" max="120" value="40" />
    </label>
  </div>
</div>

<pre id="declaration"></pre>

<p id="support-note"></p>

<div class="canvas">
  <div class="refbox" id="refbox">
    <div class="fill"></div>
  </div>
  <div class="outline"></div>
  <div class="center-marker" id="center-marker"></div>
</div>

.canvas {
  position: relative;
  width: 640px;
  height: 480px;
  overflow: hidden;
  border: 1px solid #888888;
}

.refbox {
  position: absolute;
  top: 180px;
  left: 220px;
  width: 200px;
  height: 120px;
  box-sizing: border-box;
}

.fill {
  position: absolute;
  inset: -240px;
  background: linear-gradient(to bottom right, #ff5522, #0055ff);
}

body {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: flex-start;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
}

.outline {
  position: absolute;
  top: 180px;
  left: 220px;
  width: 200px;
  height: 120px;
  box-sizing: border-box;
}

.outline {
  border: 3px dashed #e6007a;
  pointer-events: none;
}

.center-marker {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: white;
  border: 2px solid black;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

#declaration {
  margin: 0;
}

#support-note {
  margin: 0;
  color: #b3001b;
}

const selectX = document.getElementById("radius-x-keyword");
const selectY = document.getElementById("radius-y-keyword");
const posX = document.getElementById("pos-x");
const posY = document.getElementById("pos-y");
const refbox = document.getElementById("refbox");
const declaration = document.getElementById("declaration");
const marker = document.getElementById("center-marker");
const supportNote = document.getElementById("support-note");

function checkSupport() {
  const unsupported = new Set();
  for (const option of selectX.options) {
    const test = `ellipse(${option.value} ${option.value} at 0px 0px)`;
    if (!CSS.supports("clip-path", test)) {
      unsupported.add(option.value);
    }
  }
  for (const select of [selectX, selectY]) {
    for (const option of select.options) {
      if (unsupported.has(option.value)) {
        option.disabled = true;
        option.textContent += " (not supported)";
      }
    }
    if (select.selectedOptions[0]?.disabled) {
      const firstSupported = [...select.options].find(
        (option) => !option.disabled,
      );
      if (firstSupported) {
        select.value = firstSupported.value;
      }
    }
  }
  if (unsupported.size > 0) {
    supportNote.textContent = `Your browser doesn't support: ${[...unsupported].join(", ")}.`;
  }
}

function update() {
  const xKeyword = selectX.value;
  const yKeyword = selectY.value;
  const x = Number(posX.value);
  const y = Number(posY.value);

  // Build the clip-path value and apply it to the reference box
  const value = `ellipse(${xKeyword} ${yKeyword} at ${x}px ${y}px)`;
  refbox.style.clipPath = value;

  // Update the displayed declaration text and marker position
  declaration.textContent = `clip-path: ${value};`;
  marker.style.left = `${refbox.offsetLeft + x}px`;
  marker.style.top = `${refbox.offsetTop + y}px`;
}

selectX.addEventListener("change", update);
selectY.addEventListener("change", update);
posX.addEventListener("input", update);
posY.addEventListener("input", update);
checkSupport();
update();