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Let's take an example from the personal experience of our company.

 

Sometimes you can save quite a lot on images using regular css, for example in site navigation elements, a simple triangle to the left can tell the user in which direction this link leads. And how beautifully you can animate these elements by moving from one figure to another, as is usually done in flash (animation of objects). On the one hand, it is cumbersome and a lot of code, on the other hand, you can easily change the color and apply various animation effects. The tool will not disappear in the hands of a skilled craftsman.

The essence of the problem is that the http protocol server cannot track in any way whether the user is still on the site or if he has left it for a long time if the user does not perform any active actions on the site. Therefore, it is up to the user's client (browser) to inform the server that the user is still online. And this problem is solved in the following way.

It is useful for the layout designer to understand the correct principles of how block and inline elements work. As for logos, they are usually located at the top of the site, often in the header block. How to properly, semantically, validly and optimize for search engines to place the logo on the site.