React itself does not directly manage focus or accessibility, but provides tools to effectively deal with these issues. 1. Use Refs to programmatically manage focus, such as setting element focus through useRef; 2. Use ARIA attributes to improve accessibility, such as defining the structure and state of tab components; 3. Pay attention to keyboard navigation to ensure that the focus logic in components such as modal boxes is clear; 4. Try to use native HTML elements to reduce the workload and error risk of custom implementation; 5. React assists accessibility by controlling the DOM and adding ARIA attributes, but the correct use still depends on developers.

Server-siderendering(SSR)inNext.jsgeneratesHTMLontheserverforeachrequest,improvingperformanceandSEO.1.SSRisidealfordynamiccontentthatchangesfrequently,suchasuserdashboards.2.ItusesgetServerSidePropstofetchdataperrequestandpassittothecomponent.3.UseSS

WebAssembly(WASM)isagame-changerforfront-enddevelopersseekinghigh-performancewebapplications.1.WASMisabinaryinstructionformatthatrunsatnear-nativespeed,enablinglanguageslikeRust,C ,andGotoexecuteinthebrowser.2.ItcomplementsJavaScriptratherthanreplac

Immutable updates are crucial in React because it ensures that state changes can be detected correctly, triggering component re-rendering and avoiding side effects. Directly modifying state, such as push or assignment, will cause React to be unable to detect changes. The correct way to do this is to create new objects instead of old objects, such as updating an array or object using the expand operator. For nested structures, you need to copy layer by layer and modify only the target part, such as using multiple expansion operators to deal with deep attributes. Common operations include updating array elements with maps, deleting elements with filters, adding elements with slices or expansion. Tool libraries such as Immer can simplify the process, allowing "seemingly" to modify the original state but generate new copies, but increase project complexity. Key tips include each

Front-end applications should set security headers to improve security, including: 1. Configure basic security headers such as CSP to prevent XSS, X-Content-Type-Options to prevent MIME guessing, X-Frame-Options to prevent click hijacking, X-XSS-Protection to disable old filters, HSTS to force HTTPS; 2. CSP settings should avoid using unsafe-inline and unsafe-eval, use nonce or hash and enable reporting mode testing; 3. HTTPS-related headers include HSTS automatic upgrade request and Referrer-Policy to control Referer; 4. Other recommended headers such as Permis

The data-* attribute is used in HTML to store additional data, and its advantages include that the data is closely related to elements and comply with HTML5 standards. 1. When using it, name it starts with data-, such as data-product-id; 2. It can be accessed through JavaScript's getAttribute or dataset; 3. Best practices include avoiding sensitive information, reasonable naming, paying attention to performance and not replacing state management.

To style SVGs using CSS, you first need to embed SVGs inline into HTML for fine control. 1. Inline SVG allows its internal elements such as or to be directly selected through CSS and to apply styles, while external SVG only supports global styles such as width and height or filters. 2. Use regular CSS syntax such as .class:hover to achieve interactive effects, but use fill instead of color to control the color, and use stroke and stroke-width to control the outline. 3. Use class names to organize styles to avoid duplication and pay attention to naming conflicts and scope management. 4. The SVG style may be inherited from the page, and can be reset through svg*{fill:none;stroke:none;} to avoid

Adding website Favicon requires preparing icon files, placing the correct path and quoting them. 1. Prepare multi-size .ico or .png icons, which can be generated by online tools; 2. Put favicon.ico in the website root directory; 3. If you need to customize the path or support more devices, you need to add a link tag reference in the HTMLhead; 4. Clear the cache or use the tool to check whether it is effective.