Object-Oriented Programming with XHTML and CSS

<br />If only XHTML and CSS were object-oriented. . The sun should be rising from the north. However, we should look at everything from an OO perspective, and that will barely make up the numbers. In fact, someone proposed OO-style as early as a few years ago, but it can no longer be found.
So how do we do it? Now everyone knows that CSS can be written like this:
.G_G { /* xxxxxx */ }
We can think of it as a prototype , or a class , -__-b seems to be a class, and then we need to "instantiate" an object in HTML, for example:
<div class="G_G">Stupid ah ah</div>
The element will use the corresponding CSS definition, but the corresponding class alone is not enough, because our page may apply this class in multiple places. In order to handle the " private " relationship well, change the previous code to:
<div id="aoao" class="G_G">Stupid aoao</div>
In this case, the element with ID aoao will apply the definition of the .G_G class, and can use the selector #aoao{} to enter the definition of private effects, which will not affect the public .G_G class. At the same time, the priority of the #aoao definition will be higher than that of .G_G, which is in line with the common sense that private definitions take precedence over public definitions^^.
Since I used ID, a unique thing, the reuse of this privately defined thing became a problem (an ID can only appear once on a page, I don't know who said it, but it's the truth anyway). What if we want to implement multiple privatized things? Then we must implement " polymorphism ". Dig haha. Change the code again:
<div class="G_G o_O">Stupid ah ah</div>
One is "G_G" and the other is "o_O", but if we use .o_O{} , we can also define the element if the CSS is like this:
.G_G {width:100%} .o_O {color:#123456}
The elements will all be defined, and since definitions do not cascade, they will all be applied. If the code is like this, I wonder if it will be easier to understand.
<div class="layout color">Not a fool, owl</div>
.layout{width:100%} .color{color:#123456}
Next, we need to implement " encapsulation ". The child selector should be used frequently, change the code:
<div class="G_G"><span class="bendan">Stupid</span> Ouch</div>
Although both .bendan{} and .G_G .bendan{} can be defined, the latter can only be applied to elements with class "G_G". We can simply understand .bendan{} as a global definition and .G_G .bendan{} as a local definition, which will be beneficial to the modularization of our XHTML and CSS. ^^The legendary "encapsulation" appears, and then follows.
<div id="aoao" class="G_G o_O"><span class="bendan">Stupid</span> Aoao</div>
Such code can produce countless changes. If you still don't understand it, start from the beginning. ^^
In fact, these are still a long way from true object-oriented. I am just learning the clickbait, but it can be used to understand the application of ID and class.

<<: Docker stop stops/remove deletes all containers

>>: Example of making a butterfly flapping its wings with pure CSS3

CSS3 implements the sample code of NES game console

Object-Oriented Programming with XHTML and CSS

CSS3 implements the sample code of NES game console

Let's talk about the LIMIT statement in MySQL in detail

WeChat applet implements search function and jumps to search results page

Mysql updates certain fields of another table based on data from one table (sql statement)

Detailed explanation of mysql scheduled tasks (event events)

Detailed process of installing and deploying onlyoffice in docker

A possible bug when MySQL executes the sum function on the window function

Nginx cache configuration example

Vue integrates PDF.js to implement PDF preview and add watermark steps

Solution to the conflict between nginx and backend port

Recommend

Implementation of Nginx configuration https

Vue implements Tab tab switching

Full HTML of the upload form with image preview

Super simple qps statistics method (recommended)

The most complete package.json analysis

uni-app WeChat applet authorization login implementation steps

How to write a picture as a background and a link (background picture plus link)

Detailed explanation of javascript event bubbling, event capture and event delegation

Docker deploys Mysql, .Net6, Sqlserver and other containers

IIS configuration of win server 2019 server and simple publishing of website

Detailed tutorial on how to monitor Nginx/Tomcat/MySQL using Zabbix

Detailed explanation of Linux zabbix agent deployment and configuration methods

IIS7~IIS8.5 delete or modify the server protocol header Server

A bug fix for Tomcat's automatic shutdown