Cascading style sheets (CSS) allow you to organize the appearance and design of a web page. One of the most commonly used properties and its values is "display: none".
Property Definition
The property itself is multi-purpose and determines the type of display of the element in the document. Depending on the selected value, a certain section of the page can be displayed in a block, linearly, as list items, as part of a table, etc. Thus, thanks to the "display" property, you can change the type of block in the document.
As for the link "property-value display: none", it allows you to remove an element or block from the document. At the same time, the space for this piece of the page is not reserved, that is, it falls out of the stream. All the elements that are behind the "remote" simply do not see it and ignore the size and position of such a block. To return a hidden object, you need to access the document through scripts that simply change the property value to the required format. This will automatically format the page taking into account the new object on it.
Difference between display and visibility
Despite the fact that in the end both properties hide the element from the user, their principle of operation is significantly different. As mentioned above, the "display: none" option completely removes the item from the document. The block drops out of the page, thereby not taking up space in it. However, the object itself remains in the HTML code.
In turn, the visibility: hidden property hides the element from the user, but does not remove it from the document model. Thus, the reserved space for this block remains on the page. That is, the document flow will perceive and take into account the location and size of the element with the "visibility: hidden" property in exactly the same way as without it.
Such a difference in the organization of the document structure with these two properties allows you to achieve the desired result for the correct page display.
Using CSS - display: none
An Internet document allows you to use several options to determine the properties of an element. First of all, display: none can be written in a separate file of cascading style sheets. This method is the most advanced and correct, as it allows you to put all the selectors, classes and their properties into a separate document. Such a model makes it possible to very quickly find and change page settings.
In the title of the document
The second option is to define styles in the header of the document between the style tags. The effectiveness of this method is much less. It is recommended to use it only in extreme cases, since if there are a large number of styles, the readability of the page by the web designer deteriorates significantly. And this leads to errors and slows down the process of developing an Internet document. This approach is recommended only if you add a small number of styles to this tag or to debug a document.
It should be remembered that if this way of organizing styles is located in the document lower than importing a separate style sheet, then the intersecting properties will be overwritten by those that are in the body of the html document.
Div block Display: none
Another way is to add "style = display: none;" directly to the tag of the code element. This approach is often used when working with various frameworks, the purpose of which is to reduce the number of properties directly in the style sheet and display them in the Internet document itself. In addition, such a record often occurs when a page is viewed by a "code inspector." It is important to remember that using this approach, you can change the property and its value specified in the stylesheet. Therefore, you should be careful, as in the end you can create additional problems for yourself and spend some time searching for and fixing the error in the page code.
Javascript
It is also worth mentioning the additional possibility of changing this property. It refers no longer to the stylesheet and html code, but to the scripting language. Therefore, for its application it is necessary to have at least some knowledge in this area. In order to remove an element from the document flow, you can use the JavaScript property "display = none". It allows you to change the structure of the document when a specific event occurs. Also, through the use of scripts, you can dynamically ("on the fly") change the property parameter and thereby update the appearance of the page without having to reload it. This approach is useful when organizing drop-down menus, modal windows, and forms.
SEO
In the area of optimizing web content for search engines, there are many superstitions and obscure points. So, many novice SEO experts consider using the "display" property a bad manner. They explain this by the fact that search engines, seeing hidden content, begin to consider the page as spam. In their words there is some logic, but nothing more. At this time, the property of hiding an object is used often enough to format drop-down menus and hide parts of a document that are not currently interesting to the user (for example, when you select one category, information about others is deleted). This approach is used by fairly powerful Internet portals (one of them is Amazon). Thus, search bots cannot consider the use of the "display: none" property as spam.
Another thing is when this approach is used to hide individual words and characters. Despite the fact that search robots do not yet have perfect algorithms for recognizing such “spam” in documents, the likelihood that the page will be caught on this is quite high. Therefore, it is recommended to use the "display" property strictly for its intended purpose - to change the type of block or to temporarily hide it from the user's eyes.