Pixelperfect layouts tools

In a common workflow, a graphic designer creates the design of a website/application. Then, next in the process is the HTML/CSS coding. After the development process, the project is in the quality assurance (QA) phase. Sometimes it's focused only on the functional side of the project, but in a good workflow, it checks of graphic design phase. During the QA process, the designer is involved, he/she will find all pixels that are not good in your code. How would check all the details in a pixelperfect project?

The question is about mobile projects. How to check if it is still pixel perfect when it needs to be flexible in browsers? You will need to make it in described ranges. For example, you have to create HTML/CSS for ...

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