example03.html

<!-- 元のhtml -->
<div>
  <div id="sample-parent">#sample-parent</div>
  <div class="sample-parent">.sample-parent</div>
  <div class="sample-parent">.sample-parent</div>
  <div class="sample-parent">.sample-parent</div>
</div>
<!-- include処理 -->
<script src="pathto/include-html.js"></script>
<script>
  includeHtml({
    name_target: '#sample-parent',
    src_part: 'pathto/sample-part.html',
    src_id: 'sample-div',
    type_copy: 'outer',
    src_js: ['pathto/sample-script.js']
  });
</script>

result03.html

<!-- 処理後のhtml -->
<div>
  <div id="sample-parent">
    <div id="sample-div">書き換え後のテキスト</div>
  </div>
  <div class="sample-parent">.sample-parent</div>
  <div class="sample-parent">.sample-parent</div>
  <div class="sample-parent">.sample-parent</div>
</div>

sample-script.js

document.getElementById('sample-div').textContent = '書き換え後のテキスト';