Here is how you can create a dynamic Application Cache Manifest file using PHP.
You can read the full article here:-
BEST PRACTICES FOR A FASTER WEB APP WITH HTML5
By : Motyar+ @motyar
i am still working with blogger,
i created three blogs, much more in future.
The HTML5 is already supported by blogger. You just need to change your HTML of the blog and you can apply Paul's techniques to increase speed of your blog.