Run

The next level of the document hierarchy is the run, which defines a region of text with a common set of properties, represented by the @r element (§2.3.2.23). An <r >element allows the producer to specify a single set of formatting properties, applying the same information to all the contents of the run.

Just as a paragraph can have properties, so too can a run. All of the elements inside an <r >element have their properties controlled by a corresponding optional <rPr >run properties element (§2.7.8.1; §2.3.2.26), which must be the first child of the <r> element. In turn, the <rPr> element is a container for a set of property elements that are applied to the rest of the children of the <r> element.
Note: : The elements inside the <rPr >container element allow the consumer to control whether the content in the following run content is bold, underlined, or visible, for example.
example:
<w:r>
  <w:rPr>
    <w:b/>
    <w:i/>
  </w:rPr>
  <w:t>quick</w:t>
</w:r>

The run specifies two formatting properties in its run contents: bold and italic. These properties are therefore applied to all content within this run. ]