There are three ways to create a CSS loading rotator: 1. Use the basic rotator of borders to achieve simple animation through HTML and CSS; 2. Use a custom rotator of multiple points to achieve the jump effect through different delay times; 3. Add a rotator in the button and switch classes through JavaScript to display the loading status. Each approach emphasizes the importance of design details such as color, size, accessibility and performance optimization to enhance the user experience.

Use tags in HTML to group options in the drop-down menu. The specific method is to wrap a group of elements and define the group name through the label attribute, such as: 1. Contains options such as apples, bananas, oranges, etc.; 2. Contains options such as carrots, broccoli, etc.; 3. Each is an independent group, and the options within the group are automatically indented. Notes include: ① No nesting is supported; ② The entire group can be disabled through the disabled attribute; ③ The style is restricted and needs to be beautified in combination with CSS or third-party libraries; plug-ins such as Select2 can be used to enhance functions.

To use HTML button elements to achieve clickable buttons, you must first master its basic usage and common precautions. 1. Create buttons with tags and define behaviors through type attributes (such as button, submit, reset), which is submitted by default; 2. Add interactive functions through JavaScript, which can be written inline or bind event listeners through ID to improve maintenance; 3. Use CSS to customize styles, including background color, border, rounded corners and hover/active status effects to enhance user experience; 4. Pay attention to common problems: make sure that the disabled attribute is not enabled, JS events are correctly bound, layout occlusion, and use the help of developer tools to troubleshoot exceptions. Master this

HTML5, CSS and JavaScript should be efficiently combined with semantic tags, reasonable loading order and decoupling design. 1. Use HTML5 semantic tags, such as improving structural clarity and maintainability, which is conducive to SEO and barrier-free access; 2. CSS should be placed in, use external files and split by module to avoid inline styles and delayed loading problems; 3. JavaScript is recommended to be introduced in front, and use defer or async to load asynchronously to avoid blocking rendering; 4. Reduce strong dependence between the three, drive behavior through data-* attributes and class name control status, and improve collaboration efficiency through unified naming specifications. These methods can effectively optimize page performance and collaborate with teams.

Metadata in HTMLhead is crucial for SEO, social sharing, and browser behavior. 1. Set the page title and description, use and keep it concise and unique; 2. Add OpenGraph and Twitter card information to optimize social sharing effects, pay attention to the image size and use debugging tools to test; 3. Define the character set and viewport settings to ensure multi-language support is adapted to the mobile terminal; 4. Optional tags such as author copyright, robots control and canonical prevent duplicate content should also be configured reasonably.

Hello, JavaScript developers! Welcome to this week's JavaScript news! This week we will focus on: Oracle's trademark dispute with Deno, new JavaScript time objects are supported by browsers, Google Chrome updates, and some powerful developer tools. Let's get started! Oracle's trademark dispute with Deno Oracle's attempt to register a "JavaScript" trademark has caused controversy. Ryan Dahl, the creator of Node.js and Deno, has filed a petition to cancel the trademark, and he believes that JavaScript is an open standard and should not be used by Oracle

The top ten virtual currency trading platforms in Europe in 2025 include Binance, OKX, Coinbase, etc., and are selected based on compliance, security, expenses, asset types and user experience. 1. Binance: The world has the largest transaction volume, low fees, and has obtained a license in multiple countries; 2. OKX: Comprehensive products, strong technology, registered in France; 3. Coinbase: Compliance and safety, suitable for beginners, licensed in many countries; 4. Gate.io: Has a long history, high security, registered in many European countries; 5. Bitstamp: Founded early, has strong compliance, regulated by Luxembourg; 6. eToro: Supports social transactions, diversified investment, regulated by CySEC; 7. Bitpanda: World

Use tags to embed other website content into your own web page. The basic syntax is:, you can add width, height, and style="border:none;" to control the appearance; in order to achieve responsive layout, you can set the size through percentage or use containers to combine padding and absolute positioning to maintain the aspect ratio, while paying attention to cross-domain restrictions, loading performance, SEO impact, and security policies. Common uses include embedding maps, third-party forms, social media content and internal system integration.