Try entering the following 3 lines:
<p>
Here's some text.
Here's some more. This <b>word</b> is in Bold, nothing else is.
Then save as "mydoc.html", Quit, then double-click mydoc.
When I double click an .html file on my computer it opens Taco html editor by default, and I have it configured to show me the raw html. So when I double click your example I see exactly what I typed. A raw text version of an html document - no formatting
(Well except for the colors that taco adds to html tags)