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- What is the web box model
- The web box model is an important concept in web design and layout. It describes that every element in a web page is treated as a rectangular box, which contains the element's content, padding, borders, and margins. Web page box models can be divided into two types: standard box model and IE box model. The standard box model is a specification established by the W3C, while the IE box model is a model unique to Microsoft's IE browser. Mastering the principles and applications of the web page box model is very important for realizing various complex web page layout and style effects.
- Front-end Q&A 1424 2023-11-24 14:22:03
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- What are the differences between import and link
- The difference between import and link: 1. Purpose and semantics; 2. Loading method; 3. Compatibility; 4. Linking multiple style sheets; 5. Media type; 6. Dynamics; 7. Error handling; 8. Embedding set; 9. Default style; 10. Compatibility considerations; 11. Performance considerations; 12. Usage scenarios. Detailed introduction: 1. Purpose and semantics. Link is an HTML tag, used to link to external CSS files or style sheets. It is usually located in the head part of the HTML document, import is part of CSS, etc.
- Front-end Q&A 1711 2023-11-24 14:15:15
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- What are inline and block-level elements?
- Inline elements include a, span, strong, b, em, i, label, img, input, select, textarea, button, abbr, cite, code, big, small, sub, sup, etc. Block-level elements include div, p, h1-h6, form, ul, ol, dl, dt, dd, li, table, tr, td, th, hr, blockquote, address, menu, pre, etc.
- Front-end Q&A 1227 2023-11-24 13:57:43
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- What are the causes of absolute positioning failures?
- The causes of absolute positioning failures are: 1. Poor satellite signal reception; 2. Signal propagation problems; 3. Receiver failure; 4. Interference; 5. Multipath effect; 6. Hardware configuration error; 7. Software configuration error; 8. Data processing errors; 9. External interference; 10. Satellite failure, etc. Detailed introduction: 1. Poor satellite signal reception. The absolute positioning system determines position information by receiving satellite signals. If the receiver cannot receive a sufficient quantity or quality of satellite signals, it will cause the position to be unable to be determined normally and a positioning failure will occur; 2 , signal propagation issues, etc.
- Front-end Q&A 1232 2023-11-22 15:37:51
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- What are the faults of absolute positioning?
- Absolute positioning faults include: 1. Positioning signal loss; 2. Receiver software or hardware failure; 3. Interference; 4. Signal propagation delay; 5. Multipath effect; 6. Hardware configuration error; 7. Software configuration error; 8. Data processing errors; 9. External interference, etc. Detailed introduction: 1. The positioning signal is lost. The absolute positioning system needs to receive satellite signals to determine the position. If the receiver cannot receive enough satellite signals, or the received signal quality is poor, causing the position information to be unable to be determined, a positioning failure will occur. ;2. Receiver software or hardware failure, etc.
- Front-end Q&A 914 2023-11-22 15:19:45
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- What does rapid static positioning technology belong to?
- Rapid static positioning technology belongs to radio navigation technology. Radio navigation technology is a technology that uses the propagation characteristics of radio signals to receive and process the radio signals emitted by the transmitter through the receiver to determine the position, speed, attitude and other information of the target object. Fast static positioning technology mainly uses pseudo-range measurement or phase measurement of GPS satellite signals and other similar radio signal measurement methods to determine the location information of the target object. It has the advantages of high precision, high speed, high reliability, etc., so it has been widely used in military, civilian and commercial fields.
- Front-end Q&A 634 2023-11-22 15:15:21
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- What does the rapid static positioning method include?
- Fast static positioning methods include GPS positioning, inertial navigation, indoor positioning technology, ultra-wideband positioning, visual positioning, acoustic positioning, and geomagnetic positioning. Detailed introduction: 1. GPS positioning. The Global Positioning System is one of the most commonly used fast static positioning methods. It uses satellite signals to determine the position of a certain point on the earth. The GPS receiver calculates the received signal by receiving signals from at least four satellites. 2. Inertial navigation is a positioning technology based on inertial sensors such as accelerometers and gyroscopes, etc.
- Front-end Q&A 1157 2023-11-22 15:10:30
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- What are the uses of static relative positioning?
- The uses of static relative positioning are: 1. Keep the original position unchanged; 2. Adjust the position of elements; 3. Create draggable components; 4. Implement responsive layout; 5. Control the hierarchical relationship of elements; 6. Create hideable Element; 7. Control the overflow behavior of elements; 8. Implement animation effects, etc. Detailed introduction: 1. Keep the original position unchanged. The statically relatively positioned element will keep its position in the normal document flow. Even if the page scrolls or the browser window size changes, it will not move to other positions; 2 , adjust element position, statically relatively positioned elements, etc.
- Front-end Q&A 1138 2023-11-22 15:06:16
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- What are the fixed positioning tags?
- Fixed positioning tags include div, header, footer, nav, aside, figure, figcaption, etc. Detailed introduction: 1. div is a general block-level element, usually used to build page layouts. By setting its position attribute to fixed, the element can have a fixed positioning; 2. header, is a semantic block-level element. Usually used to represent the title or header information of the page, by setting its position attribute to fixed, etc.
- Front-end Q&A 1053 2023-11-22 14:58:25
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- What are the ajax versions?
- Ajax is not a specific version, but a technology that uses a collection of technologies to asynchronously load and update web page content. Ajax does not have a specific version number, but there are some variations or extensions of ajax: 1. jQuery AJAX; 2. Axios; 3. Fetch API; 4. JSONP; 5. XMLHttpRequest Level 2; 6. WebSockets; 7. Server-Sent Events; 8, GraphQL, etc.
- Front-end Q&A 1530 2023-11-22 14:00:03
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- What are the ajax websites?
- Websites that use ajax include Google, Wikipedia, Facebook, The New York Times, Amazon, StackOverflow, Twitter, Hacker News, Shopify and Basecamp, etc. Detailed introduction: 1. Many of Google’s services, including search engines, Gmail, Google Maps and Google Docs, extensively use AJAX technology; 2. Wikipedia’s search function and most page interactions use AJAX; 3. Facebook uses AJAX and so on.
- Front-end Q&A 2296 2023-11-22 13:46:41
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- What does it mean to introduce a third-party framework in css?
- The introduction of third-party frameworks into css refers to the use of CSS style libraries or frameworks from external sources in projects. These third-party frameworks are usually collections of designed and optimized CSS codes that are used to help developers quickly build websites and applications. layout and style. Reasons for using CSS to introduce third-party frameworks: 1. Save time and improve efficiency; 2. Uniformity and standardization; 3. Community support and updates; 4. Responsive design. By choosing the right framework, following best practices, and optimizing performance, you can achieve better development productivity and results.
- Front-end Q&A 1219 2023-11-21 17:43:22
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- Why is there no css framework now?
- The reasons why there is no CSS framework now: 1. The maturity and popularity of existing frameworks; 2. The compatibility of modern browsers; 3. The shift in focus of front-end development; 4. The popularity of responsive design; 5. Design and customization needs; 6. Performance considerations; 7. Community participation and updates; 8. The trend of front-end and back-end separation, etc. Detailed introduction: 1. The maturity and popularity of existing frameworks. There are already many mature CSS frameworks, such as Bootstrap, Foundation, Bulma, etc. These frameworks provide rich functions and styles, etc.
- Front-end Q&A 788 2023-11-21 17:19:38
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- Why do pseudo-elements fail?
- Reasons for pseudo-element failure: 1. Selector issues; 2. Style conflicts; 3. Inheritance issues; 4. Syntax errors; 5. Browser compatibility issues, etc. Detailed introduction: 1. Selector problem, the selector of the pseudo element may be incorrect, resulting in the target element not being selected; 2. Style conflict, if there is a style conflict in CSS, the pseudo element may become invalid; 3. Inheritance problem, Pseudo elements may not inherit certain style attributes; 4. Syntax errors. If there are syntax errors in CSS, the pseudo elements may fail; 5. Browser compatibility issues, etc.
- Front-end Q&A 1562 2023-11-21 17:13:01
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- What properties does float have?
- Float attributes include left, right, none, inherit, etc. Detailed introduction: 1. left, making the element float to the left. When the element is set to float, it will break away from the normal document flow and move to the left until it encounters the edge of the parent element or another floating element; 2. right, Make the element float to the right. When the element is set to float, it will break away from the normal document flow and move to the right until it encounters the edge of the parent element or another floating element; 3. none, the default value, the element does not float. Will stay where it is and wait.
- Front-end Q&A 2563 2023-11-21 17:06:45
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