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HTML, CSS, and JavaScript: A Practical Beginner's Guide to Building Webpages

A new beginner's guide outlines how every website is built on three core technologies: HTML, CSS, and JavaScript. HTML defines a page's structure using tags and elements, while CSS handles visual styling such as colors, fonts, and layout. JavaScript adds interactivity and logic on top of the static foundation. The guide walks learners through each technology individually before combining them in a hands-on project — a personal task tracker. Only a free text editor like VS Code and a web browser are needed to follow along.

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ProgrammingDEV Community ·

Engineer Builds Hybrid Agentic RAG System Combining FAISS and BM25 for Smarter LLM Retrieval

A developer has designed and documented an Agentic Hybrid Retrieval-Augmented Generation (RAG) architecture that merges dense semantic search via FAISS with exact keyword matching using BM25, aiming to overcome limitations of traditional static RAG pipelines. The system uses an autonomous LLM agent built on the smolagents framework, enabling dynamic decision-making about when and how to retrieve information. During development, the engineer encountered significant challenges running the model locally on CPU, including import errors, latency exceeding 213 seconds per step, and model hallucinations. These issues were resolved by switching to a cloud-hosted model, Qwen2.5-72B-Instruct, and applying dynamic score normalization with a weighted fusion parameter. The research also outlines a future roadmap for scaling the architecture toward knowledge graphs, multi-agent consensus systems, and automated valuation frameworks.

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ProgrammingDEV Community ·

How to Structure Figma Variables for Scalable UI Design Systems

Figma variables store reusable design values such as colors, spacing, and typography that can be applied consistently across components and prototypes. Organizing these variables into structured collections — including design tokens, global primitives, language, and private primitives — helps teams manage complexity as projects scale. Figma supports six variable types: color, number, string, boolean, timing, and easing, each serving a distinct design or prototyping purpose. Unlike styles, which store fixed sets of design properties, variables enable dynamic changes such as switching between light and dark modes or adapting layouts for different devices. A well-structured variable system reduces redundancy, simplifies updates, and ensures design consistency across an entire product library.

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ProgrammingDEV Community ·

Semantic vs. Prompt Caching: Finding the Cost Break-Even Point for LLM Apps

A technical analysis published on DEV Community argues that rising LLM API costs are fundamentally an architecture problem rather than a prompt engineering issue. Two main caching strategies are compared: provider-side prompt caching, which reuses repeated input prefixes at 10% of normal token cost, and semantic caching, which uses embedding similarity to skip LLM calls entirely for near-duplicate queries. The study uses a reproducible benchmark of 1,200 queries across four repetition patterns to measure where each approach becomes cost-effective. Prompt caching suits workloads with long, repeated system prompts, while semantic caching eliminates redundant calls but risks returning wrong answers on false-positive matches. The analysis concludes that neither technique touches prompt content directly, making them complementary to — not substitutes for — prompt optimization.

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