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- <style>
- .customized-counter__color-box {
- --hue: 180;
- width: 20px;
- height: 20px;
- background-color: hsl( var( --hue ), 100%, 50% );
- display: inline-block;
- }
- .customized-counter {
- border: 3px solid #333;
- padding-left: 5px;
- margin-bottom: 15px;
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- .customized-counter > div {
- display: inline-block;
- width: 50%;
- margin-left: 0;
- margin-right: 0;
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- <div id="demo-editor-update">
- <p>A <strong>black hole</strong> is a region of <a href="https://en.wikipedia.org/wiki/Spacetime">spacetime</a> exhibiting <a href="https://en.wikipedia.org/wiki/Gravitation">gravitational</a> acceleration so strong that nothing—no <a href="https://en.wikipedia.org/wiki/Particle">particles</a> or even <a href="https://en.wikipedia.org/wiki/Electromagnetic_radiation">electromagnetic radiation</a> such as <a href="https://en.wikipedia.org/wiki/Light">light</a>—can escape from it.<a href="https://en.wikipedia.org/wiki/Black_hole#cite_note-6">[6]</a> The theory of <a href="https://en.wikipedia.org/wiki/General_relativity">general relativity</a> predicts that a sufficiently compact <a href="https://en.wikipedia.org/wiki/Mass">mass</a> can deform <a href="https://en.wikipedia.org/wiki/Spacetime">spacetime</a> to form a black hole.</p>
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- <div class="customized-counter__words">
- <label>Words:
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- <div class="customized-counter__characters">
- Characters:
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