<!-- <p>This is a paragraph.</p> -->
Note: That there is an exclamation point (!) in the start tag, but not in the end tag.
<!DOCTYPE html> <html> <head> <!-- <p>This is a paragraph.</p> --> <p>This paragraph contains</p> <!--<h5 style="font-size:20px; color:blue">Heading 5 with css</h5>--> </body> </html>