


Comprehensive analysis of standard attributes and custom attributes in HTML5_html5 tutorial skills
As explained in HTML5 syntax, elements can contain attributes to set various properties for an element.
Some properties are defined as global and can be used on any element, while others are defined as element-specific. All properties have a name and a value, which look like the example below.
Here is an example of using HTML5 attributes, demonstrating how to mark a div element with an attribute named class and the value "example":
Theattribute can only be specified in the opening tag and must not be used in the closing tag.
HTML5 attributes are not case-sensitive and can be used in all uppercase or a mixture of uppercase and lowercase, although the most common convention is to always use lowercase.
Standard Attributes
The attributes listed below are supported by almost all HTML5 tags.
|
Options | Function | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
accesskey | User-defined | Define keyboard shortcuts for accessing elements. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
align | right, left, center | Align labels horizontally. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
background | URL | Set a background image behind the element. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
bgcolor | Numerical value, hexadecimal value, RGB value | Sets a background color behind the element. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
class | User defined. | Categories an element to facilitate the use of cascading style sheets. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
contenteditable | true, false | Defines whether users can edit the content of the element. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
contextmenu | Menu id | Define a context menu for the element. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
data-XXXX | User defined. | Custom attributes. Authors of HTML documents can define their own attributes. Custom properties must start with "data-". | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
draggable | true,false,auto | Defines whether the user can drag the element. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
height | numeric value | Define the height of a table, image, or table cell. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
hidden | hidden | Defines whether the element should be visible. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
id | User defined. | named elements to facilitate the use of cascading style sheets. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
item | element list. | is used to combine elements. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
itemprop | List of entries. | is used to combine entries. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
spellcheck | true, false | Defines whether the element must have spelling or error checking. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
style | CSS style sheet. | defines inline styles for elements. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
subject | User-defined id. | defines the items associated with the element. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
tabindex | Tab number | is determined by the tab order of the elements. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
title | User defined. | The "popup" title of theelement. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
valign | top, middle, bottom | Vertical alignment of tags within HTML elements. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
width | Numeric value. | Defines the width of tables, images and table cells. |
Custom attributes
HTML5 also introduces a new feature, which is the ability to add custom data attributes.
Custom data attributes start with data- and are named based on our needs. Here is a simple example:
...
Two of the above examples Custom attributes called data-subject and data-level are fully valid in HTML5. We can also get their values using the JavaScript API or in CSS in a similar way to standard properties.
Add custom attributes to HTML elements and access them through JavaScript. If you have tried it before, you will find that it is easy to ignore tag validation, and HTML5 can provide you with the ability to create and use your own elements within a valid web page. Attribute function.
Create HTML5 file:
If you haven’t decided which one to use yet, you can copy the code below:
- /span>
- >
- html
- >
- head
- >
- script
- >
- /*functions here*/
- script
- >
- head
- >
- body
- >
- body
- >
- html
- >
Set custom elements in the body and access them using JavaScript elements in the head script area.
Create element:
First, add some simple content and elements such as custom attributes and IDs so that we can identify the JavaScript example.
- div id="product1" data-product-category="clothing"
- >
- Cotton Shirt
- div
- >
As you can see, the custom attribute has the form: "data-*", set the name in the "data-" part or a name of your choice. Use custom attributes in HTML5, this is the only way that works. Therefore, only use this method if you want to verify whether the web page is valid.
Of course, the project details determine whether the custom property is useful to you and how you name it. This example can be applied to retail websites across different product categories.
Custom attributes allow you to use JavaScript code within the page to set elements in a special way, for example, to animate the display function. If there are no standard HTML elements, we recommend using custom attributes.
Add test button
Use your own JavaScript elements on the page to execute events, provided that the following code is added to the page:
- input type="button" value="get attribute" onclick="getElementAttribute ('product1')"
- />
Get attributes:
The most common way to access attributes in JavaScript is to use "getAttributes", which is also the first step we need to do. Add the following function in the head script area of the page:
- function getElementAttribute(elemID) {
- var theElement = document.getElementById(elemID);
- var theAttribute = theElement.getAttribute('data-product-category'); 🎜> alert(theAttribute);
- }
Here, we have added the alert value to the example. Of course, you can also add it in the script according to your own needs.
Get data:
You can use an element dataset instead of DOM "getAttributes", which may be more efficient, especially in certain cases where the code iterates through multiple attributes. However, browser support for datasets is still very low. So keeping that in mind, this code executes the same process as the method // after.
//var theAttribute = theElement.getAttribute('data-product-category');
var theAttribute = theElement.dataset.productCategory;
Remove "data-" from the attribute name in the dataset, it Still included in the HTML.
Please note that if your custom attribute name has a hyphen in it, this will appear in camel-case form when accessed via data, i.e. ("data-product-category" becomes "productCategory").
Other modules and functions
We have obtained the property, scripts can still set and remove it. The code below demonstrates how to set properties using standard JavaScript modules and datasets.
- //DOM method
- theElement.setAttribute('data-product-category', 'sale');
- //dataset version
- theElement.dataset.productCategory = "sale";
- You can also use DOM methods or data sets to delete an attribute:
- //DOM method
- theElement.removeAttribute('data-product-category');
- //dataset version
- theElement.dataset.productCategory = null;

The tools and frameworks that need to be mastered in H5 development include Vue.js, React and Webpack. 1.Vue.js is suitable for building user interfaces and supports component development. 2.React optimizes page rendering through virtual DOM, suitable for complex applications. 3.Webpack is used for module packaging and optimize resource loading.

HTML5hassignificantlytransformedwebdevelopmentbyintroducingsemanticelements,enhancingmultimediasupport,andimprovingperformance.1)ItmadewebsitesmoreaccessibleandSEO-friendlywithsemanticelementslike,,and.2)HTML5introducednativeandtags,eliminatingthenee

H5 improves web page accessibility and SEO effects through semantic elements and ARIA attributes. 1. Use, etc. to organize the content structure and improve SEO. 2. ARIA attributes such as aria-label enhance accessibility, and assistive technology users can use web pages smoothly.

"h5" and "HTML5" are the same in most cases, but they may have different meanings in certain specific scenarios. 1. "HTML5" is a W3C-defined standard that contains new tags and APIs. 2. "h5" is usually the abbreviation of HTML5, but in mobile development, it may refer to a framework based on HTML5. Understanding these differences helps to use these terms accurately in your project.

H5, or HTML5, is the fifth version of HTML. It provides developers with a stronger tool set, making it easier to create complex web applications. The core functions of H5 include: 1) elements that allow drawing graphics and animations on web pages; 2) semantic tags such as, etc. to make the web page structure clear and conducive to SEO optimization; 3) new APIs such as GeolocationAPI support location-based services; 4) Cross-browser compatibility needs to be ensured through compatibility testing and Polyfill library.

How to create an H5 link? Determine the link target: Get the URL of the H5 page or application. Create HTML anchors: Use the <a> tag to create an anchor and specify the link target URL. Set link properties (optional): Set target, title, and onclick properties as needed. Add to webpage: Add HTML anchor code to the webpage where you want the link to appear.

Solutions to H5 compatibility issues include: using responsive design that allows web pages to adjust layouts according to screen size. Use cross-browser testing tools to test compatibility before release. Use Polyfill to provide support for new APIs for older browsers. Follow web standards and use effective code and best practices. Use CSS preprocessors to simplify CSS code and improve readability. Optimize images, reduce web page size and speed up loading. Enable HTTPS to ensure the security of the website.

h5 pages can generate links in two ways: create links manually or use short link services. By manually creating, you just need to copy the URL of the h5 page; through the short link service, you need to paste the URL into the service and then get the shortened URL.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

WebStorm Mac version
Useful JavaScript development tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 Linux new version
SublimeText3 Linux latest version

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.