Web development process under web standards

Web development requires three people: designers, programmers, customers, and project managers.
A. Designers are responsible for plane effect design.
B. Programmers are responsible for system development
C. Customer requirement acceptance system
D. The project manager is responsible for overall planning.
Here we will not talk about the detail of requirement analysis, but the details of negotiation with the customer. We assume that the requirement has been determined.
The web Standards are separated from the structure and performance. Therefore, designers and programmers can develop in parallel after the project manager's requirements are determined, breaking the previous, inefficient development processes that can be developed only when the system is determined by plane effects. All systems can have the development efficiency of MVC-type systems.
Below is a flowchart

Determine the requirements. After the system planning is completed:
The programmer confirms that the xhtml and uidesigns are synchronized.
After the xhtml structure is determined:
CSS production and program development are synchronized
After CSS and program development are completed:
CSS and xhtml are connected.
As for the presentation layer, it can be developed after the xhtml structure, or completed in the program development stage, such as AJAX. This is the work of programmers, and they can control program interfaces.
Of course, this is just a piece of thinking. There may be many problems in the connection process. If you want to promote it, it will take a long time.
In the entire development process, everyone must have a certain understanding of the standard, the rationality of the structure depends on the project manager and programmers, the artistic effect depends on the ui designer, browser compatibility depends on the CSS producer, designers also need to have a certain understanding of CSS. DOM cannot destroy the structure of CSS.