Strong is a formatting element used to make font weight bold. Strong shows same weighted text like bold element <b>. Strong content has more importance.
<strong>Content</strong>
Or
<tag><strong>Content</strong></tag>
You can apply strong element to any element and use any where within a HTML document.
Strong is a pair tag and output of strong element is bold text like you can see in above example.
Open notepad or any other text editor, follow the following points.
save file with name task.html or task.htm and then open it using any browser and see results.
Don't forget strong is non empty element which means it always comes in pair and it has more importance than Bold Element.