CSS padding-inline-end Property - Playground Example

<!DOCTYPE html><html><head><style type="text/css">.example {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
  max-width: 640px;
  margin: 24px;
}

.note {
  font-size: 13px;
  color: #374151;
  margin-bottom: 8px;
}

.box {
  position: relative;
  border: 2px solid #4b5563;
  background: #f3f4f6;
  padding: 12px;
  padding-inline-end: 60px;
  box-sizing: border-box;
}

.box::after {
  /* marker aligned to the padding-inline-end edge */
  content: '';
  position: absolute;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: #ef4444;
  inset-inline-end: 60px;
  pointer-events: none;
}

.box p {
  margin: 0;
  background: rgba(255,255,255,0.6);
  display: inline-block;
  padding: 6px 8px;
}

.box[dir='rtl'] p {
  /* ensure the inline content direction is visible */
  text-align: right;
}
</style></head><body><div class="example">
  <p class="note">The red line indicates the padding-inline-end edge (60px).</p>
  <div class="box" dir="ltr">
    <p><strong>LTR:</strong> This box has padding-inline-end set to 60px.</p>
  </div>
  <div class="box" dir="rtl">
    <p><strong>RTL:</strong> This box has padding-inline-end set to 60px.</p>
  </div>
</div></body></html>