I'm working on a project where I need to render screenshots of web pages, but I'm facing a bit of a challenge. I'm looking for a screenshot API that allows me to customize the appearance of the page before capturing the screenshot. 
Also, I'm hoping to find a solution that can block pop-ups and hide cookie banners from the screenshots. I've tried a few different screenshot APIs, but none of them seem to cover all of the requirements. I need to be able to take both single-element and full-page screenshots and in some cases, I need very specific features. 
There are so many tools out there, and I'm feeling a bit overwhelmed trying to find the right one for my needs. Any recommendations or advice would be greatly appreciated.

Have you checked https://developer.mozilla.org/en-US/docs/Web/API/Screen_Capture_API/Using_Screen_Capture ?

I totally understand the challenge you're facing. It can be overwhelming to sift through all the different screenshot APIs out there. Last year when I was looking for one, I became aware of this, didn't know the number of options would be so high.

While I can't say for sure if the screenshot API I've been using will cover all your needs since I'm not sure of all your specific requirements, I can definitely recommend checking out the features listed on their website. 

From my experience, it offers customizable appearance options for web pages before capturing screenshots. You can run custom JavaScript in the context of the page; it is executed once the page's DOM has fully loaded, but before capturing the screenshot. It does have features to block pop-ups and hide cookie banners. Plus, it allows you to take both single-element and full-page screenshots.

I don't think it will take you long to see if it's a good fit for your project, but if there is something you're not sure about, I encourage you to contact them directly. Honestly, I don't often get to praise customer support, but in this case - easily 10/10. 

That was fast, thanks a million. Looking into both of these.