web-front-basic

本文探讨了不再推荐使用的HTML标记,如<font>和<center>等,并介绍了XHTML中的规范要求,例如如何正确声明空元素及使用双引号标注属性值。

不再推荐使用的标记

 

<font>:为文字定义字体、字号等

<big><small>:增大、缩小字型

<i>:斜体文字

<b>:加粗文字

<u>:给文字加下划线

<s><strike>:跟文字加删除线

<center>:文本居中

 

 

 

 

<q>适用于文字段中少量的引用,<blockquote>适用于一段或多段文字的引用。同时, IE浏览器并不支持标签

 


 

在严格的HTML中,body的直接子孙只能是块元素,内联元素必须包含于块元素。

 

内联元素只能包含文本和其他内联元素,不能包含任何的块元素。

 

<p>元素不能包含块元素

 

<blockquote>不能直接包含文本,必须先用块元素包装。<blockquote><p>引用</p>

</blockquote>

 

 


 

 

XHTML里,我们必须声明我们的意图。如果元素是空的,在最后的“>”前加”/”让浏览器知道我们的意图。

 

所有的属性值必须非空,并且带双引号。<input type=radio” checked=checked” />

 

字体类别(5)

 

 

 

 

 

 

 

 

 






font-family: simsun, STXihei, STSong, Times New Roman, Georgia, Times, serif;



 

font-family: simhei, STHeiti, STXihei, Verdana, Geneva, Arial, sans-serif;

 

 

 

 

\



color:rgb(80%,  40%, 0%);

  

background-position: top/center/bottom /left/center/right;

 

链接能同时处于几个状态吗?比如link可以是visited的,鼠标又停留在上面(hover),而且用户马上要点击(active)它。

答:可以的,这时候应用哪个规则取决于规则的顺序,越靠后越优先。LOVEHATE

 

 

### QR Code Generation and Parsing in Web Development In modern web development, generating and parsing QR codes can be efficiently achieved using various libraries that cater specifically to these tasks. For instance, a popular choice is the `qrcode` library which allows developers to create QR codes easily within their applications[^1]. This library supports multiple formats including text, URLs, vCards, etc., making it versatile for different use cases. For implementing this functionality on the frontend side of web projects written primarily in JavaScript or TypeScript, one might consider utilizing dedicated packages such as `jsqr`, an efficient decoder implemented purely in JS without any dependencies. When integrating server-side operations into the process—such as storing generated images before sending them back to clients—one could leverage powerful HTTP clients mentioned elsewhere, like `httpx` or even simpler alternatives depending upon specific requirements[^2]. To demonstrate how simple creating a basic QR code generator would look: ```javascript // Import necessary modules from qrcode package import { toCanvas } from 'qrcode'; function generateQRCode(canvasElementId, content) { const canvas = document.getElementById(canvasElementId); // Generate QR Code directly onto specified HTML Canvas element toCanvas(canvas, content).then(() => { console.log('Successfully created!'); }).catch((error) => { console.error(error); }); } ``` This snippet shows how straightforward adding QR code capabilities becomes when leveraging well-maintained third-party tools designed explicitly around handling barcodes/QR codes during web application construction phases. --related questions-- 1. What are some best practices for optimizing performance while working with large volumes of data through APIs? 2. How does incorporating asynchronous processing improve user experience in real-time applications? 3. Can you provide examples where combining front-end frameworks with backend services enhances overall system architecture efficiency? 4. In what scenarios should developers prefer custom-built solutions over existing open-source libraries concerning barcode scanning functionalities?
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