The Internet is used by millions daily - millions of websites - billions of web pages. Much has been written about their quality.
By and large, websites do not exist to demonstrate the technical brilliance of the programmer, the artistic talents of the designer or the eloquence of the marketing department.
They act as repositories of data. The higher the quality and the faster it is made available to a visitor, the more successful the website will be.
The data may be information or a sales pitch but of whatever type, data is the raison d'étre of the website and it is critical to the success of the website.
Do not concentrate on the appearance to the detriment of the content.
Firstly, the visitor's appreciation of the quality of the website's appearance wears off very quickly if the content is mediocre.
Secondly, poor content detracts from good search engine rankings. Good content will have incorporated keywords into both the content and the code.
So, focus the website, write good content and put it all together in a pleasing package - which is the purpose of this microscopic treatise.