CSS stroke-width Property - Playground Example

<!DOCTYPE html><html><head><style type="text/css">.example {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  display: flex;
  gap: 24px;
  align-items: flex-start;
  color: #222;
}

.svg-demo {
  background: #f8f9fb;
  padding: 12px;
  border-radius: 8px;
  box-shadow: 0 1px 0 rgba(0,0,0,0.03) inset;
}

.stroked {
  stroke: #1a73e8;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.thin {
  stroke-width: 1;
}

.medium {
  stroke-width: 4;
}

.thick {
  stroke-width: 8;
}

.legend {
  list-style: none;
  margin: 0;
  padding: 6px 0 0 0;
  font-size: 13px;
}

.legend li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.sw-sample {
  width: 40px;
  height: 10px;
  display: block;
}

.sw-sample svg { display: block; }</style></head><body><div class="example">
  <svg class="svg-demo" width="400" height="140" viewBox="0 0 400 140" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false">
    <line x1="20" y1="20" x2="380" y2="20" class="stroked thin" />
    <line x1="20" y1="60" x2="380" y2="60" class="stroked medium" />
    <line x1="20" y1="100" x2="380" y2="100" class="stroked thick" />
    <rect x="20" y="110" width="60" height="20" class="stroked medium" />
    <circle cx="120" cy="120" r="10" class="stroked thick" />
    <text x="160" y="125" class="stroked thin">stroke-width via CSS</text>
  </svg>

  <ul class="legend">
    <li>
      <svg class="sw-sample" viewBox="0 0 40 10" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false">
        <line x1="2" y1="5" x2="38" y2="5" class="stroked thin" />
      </svg>
      <span>.thin  -  stroke-width: 1</span>
    </li>
    <li>
      <svg class="sw-sample" viewBox="0 0 40 10" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false">
        <line x1="2" y1="5" x2="38" y2="5" class="stroked medium" />
      </svg>
      <span>.medium  -  stroke-width: 4</span>
    </li>
    <li>
      <svg class="sw-sample" viewBox="0 0 40 10" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false">
        <line x1="2" y1="5" x2="38" y2="5" class="stroked thick" />
      </svg>
      <span>.thick  -  stroke-width: 8</span>
    </li>
  </ul>
</div></body></html>