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In building a browser carcasing, it is the HTML that works with the div blocks and their CSS properties. To limit yourself to the number of tags on the web page would be stupid. The power of modern computers is sufficient to download and build a page of the website where only HTML+CSS is used and there is no volume of multimedia files (most pictures, music, videos, etc.) almost without convenience. After downloading and setting up the web page(s) above, it does not pay much attention to the computer. Examination: Block the gate as long as you need. The only thing to remember in this situation is the method of calculating block parameters. When the block's parameters are clearly set, the browser doesn't spend any effort computing it. When the block parameters are inaccurate, then the browser needs to be on the basis of the page markings to know its meaning, which takes some time. For example, a 250px bloc has been set, the browser has taken this value and is working smoothly further; a 25% wide browser has been placed, the breadth of the parent block is considered to be the breadth of the parent unit and the exact value of the width of the encumbered. The example is simplified for understanding and somewhat rude, but the point is clear. Try a lot of tags to make their properties clear.The other case is javascript,flash, multimedia on the page... They can seriously disrupt the client part of the website. javascript and flash are loaded by the pros even after the pages are downloaded, using various calculations. These and similar web programming elements need to be very careful. I've often met a website with a huge number of whistles and js peppers, a beautiful flash drive with 100,500 effects and similar, most often unnecessary properties, and these websites are really stopping.I would like to draw your attention to the fact that many of the painters have listened to the non-navigational verbs of the tables at all stop using the table. All the tables are made by div. It's incorrect. The page cannot be marked in a table, but if the front page is to be displayed, for example, by a primer, it should be displayed using the table. Is that why you have so many blocks on the page?