Q361. How do ARIA live regions announce dynamic content?
Live regions announce content that changes without a page reload, such as form errors, toast messages, search result counts or a chat log. The aria-live attribute has val...
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Q362. How do lazy loading and code splitting improve performance?
Lazy loading defers work until it is needed. For images, loading="lazy" and decoding="async" defer off-screen loads, but never lazy-load the LCP image because it delays t...
Q363. Why do dynamically constructed Tailwind class names fail to render?
Tailwind's JIT scans the files listed in content and generates only classes it finds as literal strings. Class names built dynamically are invisible to the scanner. ```js...
Q364. How do slots and component composition work in Svelte?
Slots let a parent pass markup into a child. A default slot is placed with slot in the child and any children of the parent's component tag fill it. Named slots use slot ...
Q365. What are Route Handlers and how do they differ from API Routes?
Route Handlers live in app/api/.../route.ts and export HTTP-method functions such as GET, POST, PUT, DELETE and PATCH. They receive a standard Request and return a Respon...
Q366. What is the difference between standalone components and NgModules?
Traditional Angular organises components, directives and pipes into NgModules that declare what belongs together and import other modules. Standalone components skip that...
Q367. How do Vue components communicate with each other?
The primary patterns are props down and events up. A parent passes data via props declared with defineProps, and listens to child events emitted with defineEmits. For dee...
Q368. How do you manage background processes and signals?
Bash can start, inspect and signal processes. Append `&` to run a job in the background and `$!` holds its PID. `wait` blocks until it finishes. ```bash sleep 30 & pid=$!...
Q369. How does metaprogramming and method_missing work in Ruby?
Ruby programs can define methods and classes at runtime. Common tools include `define_method`, `send`, `respond_to?`, `instance_variable_get`, `class_eval` and hooks such...
Q370. When should you use guard instead of if let?
Both unwrap optionals, but `guard` is designed for early exit and keeps the happy path unindented. Its `else` branch must exit the current scope with `return`, `break`, `...