Hello,
In my project I generate programmatically HTML files with some tags, for example,
<br style="mso-break-type:section-break"/>
<span style="mso-element:field-separator">
<w:Sdt SdtDocPart="t" DocPartType="Table o…...SdtDocPart="t" DocPartType="Table of Contents" DocPartUnique="t"...are included to generate a Table of Contents and other stuffs...