In order to add source code to your page, you'll have to have some code to work with. Whether it's an application that links to your newsletter or some other feature, track down the HTML ...

SEOs look at the source code of almost every page – I do even when I am not analyzing the page and just browsing. That’s quite natural, I’ve been looking for tools that can represent the ...

As a quick and simple explanation, when you navigate to a website, your browser receives the page’s HTML ... page source”). Or you can even get an interactive view of the page’s code ...