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<li><ahref="#extensions-to-the-htmlelement-interface"><spanclass="secno">8 </span>Extensions to the <codetitle="">HTMLElement</code> Interface</a></li>
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<li><ahref="#extensions-to-the-range-interface"><spanclass="secno">9 </span>Extensions to the <codetitle="">Range</code> Interface</a></li>
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<li><ahref="#extensions-to-the-mouseevent-interface"><spanclass="secno">10 </span>Extensions to the <codetitle="">MouseEvent</code> Interface</a></li>
<p>The term <dfnid="scrolling-area">scrolling area</dfn> refers to a box of a <ahref="#viewport">viewport</a> or an element that has the following edges, depending on the
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<ahref="#viewport">viewport</a>'s or element's scrolling box's <ahref="#overflow-directions">overflow directions</a>.
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<table>
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<tableclass="complex data">
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<thead>
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<tr>
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<th>If the <ahref="#overflow-directions">overflow directions</a> are…
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<th>For a <ahref="#viewport">viewport</a>
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<th>For an element
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<tbody>
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<tr>
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<td>rightward and downward
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<td>
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<tdclass="long">
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<dl>
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<dt>top edge
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<dd><p>The top edge of the <ahref="#initial-containing-block">initial containing block</a>.
<dd><p>The left-most edge of the left edge of the <ahref="#initial-containing-block">initial containing block</a> and the left <ahref="#margin-edge">margin edge</a> of the
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<ahref="#viewport">viewport</a>'s all descendant boxes.
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</dl>
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<td>
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<tdclass="long">
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<dl>
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<dt>top edge
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<dd><p>The element's top <ahref="#padding-edge">padding edge</a>.
<dd><p>The top-most edge of the top edge of the <ahref="#initial-containing-block">initial containing block</a> and the top <ahref="#margin-edge">margin edge</a> of the
<dd><p>The left-most edge of the left edge of the <ahref="#initial-containing-block">initial containing block</a> and the left <ahref="#margin-edge">margin edge</a> of the
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<ahref="#viewport">viewport</a>'s all descendant boxes.
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</dl>
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<td>
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<tdclass="long">
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<dl>
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<dt>top edge
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<dd><p>The top-most edge of the element's top <ahref="#padding-edge">padding edge</a> and the top <ahref="#margin-edge">margin edge</a> of the element's all descendant boxes,
<dd><p>The top-most edge of the top edge of the <ahref="#initial-containing-block">initial containing block</a> and the top <ahref="#margin-edge">margin edge</a> of the
<dd><p>The left edge of the <ahref="#initial-containing-block">initial containing block</a>.
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</dl>
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<td>
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<tdclass="long">
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<dl>
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<dt>top edge
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<dd><p>The top-most edge of the element's top <ahref="#padding-edge">padding edge</a> and the top <ahref="#margin-edge">margin edge</a> of the element's all descendant boxes,
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