Hi,
I have tested the code your provided , Below is my result:
Sample Site
hello?
Maybe it works?
I am in a puzzle about why we got the different result with the same the code? I want to explain my result to you:
Because in your content page, the Content's ContentPlaceHolderID="ContentPlaceHolder1", the ContentPlaceHolder control is where you want your Default.aspx to place their content. So, the content of the master page will covered
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
Yours sincerely,
Amanda Wang
Microsoft Online Community Support