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- What are the three commonly used selectors in css?
- The three commonly used selectors in CSS are: 1. Element selector; 2. Class selector; 3. ID selector. Detailed introduction: 1. Element selector, which is the most basic selector. It selects elements according to the tag name of HTML elements; 2. Class selector, uses "." to select elements with specific classes. The class name can It is any alphanumeric character, but it must start with a letter; 3. ID selector, use "#" to select elements with a specific ID. The ID should be unique, that is, each ID can only correspond to one element, etc.
- Front-end Q&A 2195 2023-12-19 17:06:11
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- Why is position blocked?
- Reasons for position being blocked: 1. Security and privacy considerations; 2. Performance optimization; 3. Requirements for specific application scenarios; 4. Compatibility issues; 5. Specific layout requirements; 6. Code maintenance and readability; 7. Conflict avoidance and conflict resolution. Detailed introduction: 1. Security and privacy considerations. In some cases, developers or organizations may block the position attribute for security or privacy reasons; 2. Performance optimization. In some cases, the position attribute may cause page Rendering performance drops, etc.
- Front-end Q&A 1194 2023-12-19 16:41:13
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- Why do we use frameworks when writing css?
- The reasons why frameworks are used when writing CSS are: 1. Rapid development; 2. Uniformity; 3. Responsive design; 4. Component development; 5. Easy maintenance and expansion; 6. Reduce development costs; 7. Improve code readability flexibility; 8. Easy team collaboration; 9. Better compatibility; 10. Community support. Detailed introduction: 1. Rapid development. The framework provides pre-designed layouts, components and styles. Developers can directly use these ready-made resources without writing CSS from scratch; 2. Uniformity. Using the framework can ensure the stability of the entire project. The style is consistent and so on.
- Front-end Q&A 634 2023-12-19 16:18:58
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- What are the web front-end css frameworks?
- The web front-end css framework includes: 1. Bootstrap; 2. Foundation; 3. Bulma; 4. Semantic UI; 5. Skeleton; 6. UI Kit; 7. Materialize CSS; 8. Tailwind CSS; 9. Specter; 10. Base. Detailed introduction: 1. Bootstrap, this is a very popular CSS framework developed by Twitter. It provides responsive web design and more.
- Front-end Q&A 786 2023-12-19 16:11:12
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- What are pseudo-classes and pseudo-elements in css
- Pseudo-classes in CSS are selectors used to select elements that are in a specific state, which are usually invisible or not represented by a class or ID of the HTML element itself. Pseudo-elements in CSS are more like child elements of an element, but they are not actually part of the real DOM tree. Pseudo-elements allow applying styles to specific parts of an element without adding additional HTML markup. Pseudo-classes and pseudo-elements provide a flexible way to select and style specific elements or element states, and they are very useful tools in CSS.
- Front-end Q&A 916 2023-12-19 15:58:15
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- What are the built-in objects of DOM?
- dom内置对象有：1、document；2、window；3、navigator；4、location；5、history；6、screen；7、document.documentElement；8、document.body；9、document.head；10、document.title；11、document.cookie。
- Front-end Q&A 688 2023-12-19 15:45:04
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- What are the built-in objects in jsp
- The built-in objects of jsp are: 1. request; 2. response; 3. pageContext; 4. session; 5. application; 6. out; 7. config; 8. page. Detailed introduction: 1. request, HttpServletRequest object, represents the HTTP request sent by the client, through which the request parameters, header information, path information, etc. can be obtained; 2. response, etc.
- Front-end Q&A 1505 2023-12-19 15:06:20
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- What are the instructions for capturing events?
- The instructions for capturing events are: 1. addEventListener; 2. attachEvent; 3. on; 4. bind; 5. unbind; 6. trigger; 7. hover, etc. Detailed introduction: 1. addEventListener, which is the most commonly used capture event command, which allows adding event listeners to elements; 2. attachEvent, which is the event binding method of the old version of IE browser. Events bound using this method can only Works in IE browser and more.
- Front-end Q&A 779 2023-12-19 14:52:19
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- What are the new features of h5 and css3
- The new features of h5 are: 1. Semantic tags; 2. Form enhancement; 3. Video and audio support; 4. Canvas drawing; 5. Local storage; 6. Drag and drop API; 7. Geography API. The new features of css3 are: 1. RGBA and HSLA color modes; 2. Text shadow; 3. Border rounded corners; 4. Box model; 5. Multi-column layout; 6. Flexible box layout; 7. Grid layout; 8. Gradients and shadows; 9. Transitions and animations.
- Front-end Q&A 1557 2023-12-19 14:44:40
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- What are the new features of html5 and css3
- New features of html5: 1. Semantic tags; 2. Form enhancement; 3. Video and audio support; 4. Canvas drawing; 5. Offline storage; 6. Geolocation; 7. Drag and drop support. New features of css3: 1. Border rounded corners; 2. Shadow; 3. Gradient; 4. Animation and transition; 5. Text decoration; 6. Multi-column layout; 7. Flexible box layout; 8. Grid layout. HTML5 and CSS3 introduce many new features that allow developers to create richer, dynamic and interactive web pages.
- Front-end Q&A 921 2023-12-19 14:18:28
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- What css style selectors are there?
- CSS style selectors include: 1. Element selector; 2. Class selector; 3. ID selector; 4. Descendant selector; 5. Child element selector; 6. Adjacent sibling selector; 7. Attribute selector ;8. Pseudo-class selector; 9. Pseudo-element selector. Detailed introduction: 1. Element selector, this is the most basic selector, which selects elements according to the tag name of HTML elements; 2. Class selector, uses "." to select elements with a specific class; 3. ID selection filter, use "#" to select elements with specific IDs, etc.
- Front-end Q&A 1336 2023-12-19 14:12:02
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- what is localstorage
- localStorage is a web API that can store and retrieve data in a web browser. It allows websites to store data in the user's local browser instead of on the server. It can be used to store many different types of data, such as user settings, preferences, shopping cart data, etc. There are different storage limits in different browsers, and there is usually a maximum storage limit. It can be used to improve the user experience of the website and provide personalized services. But you need to pay attention to privacy and so on when using localStorage.
- Front-end Q&A 1292 2023-12-19 14:07:10
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- What does it mean to block all cookies?
- Blocking all cookies means disabling the acceptance and storage of cookies sent by websites in your browser. Blocking all cookies may affect your experience on many websites, because many websites use cookies to provide personalized services, store user information, or track user behavior. Types of websites that may be affected include social media sites, shopping sites, news sites, banking and financial sites. Blocking all cookies is a way to protect privacy and data security, but it will also affect the normal operation and use experience of some websites.
- Front-end Q&A 1772 2023-12-19 14:01:28
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- What are browser cookies
- A browser cookie, also known as a web cookie, HTTP cookie or browser cache, is a small text file that is stored on a user's computer. When a user visits a website through a web browser, the website can place one or more cookies on the user's computer to identify the user and track their behavior on subsequent visits. Its main features include session management, personalized experience, website performance optimization and ad targeting. Potential risks include privacy issues, security issues, and cross-site request forgery attacks.
- Front-end Q&A 4653 2023-12-19 13:51:11
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- What are cookies
- A cookie is a small data file stored on a user's computer and is commonly used in web applications to track user behavior and personalize experiences. The working principle is that when a user visits a Web site for the first time, the server will send one or more cookies to the user's browser. These cookies usually contain some identifiers and values so that the server can identify and track the user. When the user visits again, The browser will send the previously stored cookie back to the server, and the server can identify the user based on the information in the cookie, etc.
- Front-end Q&A 1858 2023-12-19 13:44:09
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