Web on Commentary of Takao

React 19 New Features: What Developers Need to Know

Wed, 08 Jul 2026 10:00:00 +0900

What Changed in React 19

React 19 is not a minor 업데이트 but a paradigm shift. Stable 서버 Components, new hooks, and the React Compiler fundamentally change how developers write applications.

Stable 서버 Components

React 서버 Components (RSC) are now production-ready. By rendering on the 서버 and sending HTML to the client, they reduce bundle size significantly.

// app/page.jsx — Server Component (default)
export default async function Home() {
 const posts = await db.query('SELECT * FROM posts');
 return (
 <ul>
 {posts.map(post => (
 <li key={post.id}>{post.title}</li>
 ))}
 </ul>
 );
}

Components using useState or useEffect must declare “use client” at the top.

Web Performance Monitoring Tools Compared 2026

Wed, 08 Jul 2026 10:00:00 +0900

Why Lighthouse Is Not Enough

Lighthouse is an excellent diagnostic tool, but it only measures lab data, not real user experience. Standard practice in 2026 combines lab measurements with Real User Monitoring (RUM).

1. Web Vitals — Chrome UX Report and CrUX API

Google’s Chrome UX Report aggregates field data from real Chrome users. You can query it via API to analyze both your own and competitors’ sites.

const response = await fetch(
 'https://chromeuxreport.googleapis.com/v1/records:queryRecord?key=YOUR_KEY',
 {
 method: 'POST',
 body: JSON.stringify({
 origin: 'https://example.com',
 metrics: ['largest_contentful_paint', 'cumulative_layout_shift']
 })
 }
);

2. Sentry 성능

Well-known for error monitoring, Sentry also offers robust 성능 tracing. It captures transactions end-to-end, from frontend to backend, with automatic instrumentation for React and Next.js. Setup takes minutes.

Google I/O 2025: Integrating Web Technologies and AI

Mon, 05 May 2025 00:00:00 +0900

Introduction

At Google’s annual developer conference, Google I/O 2025, major announcements highlighted the convergence of artificial intelligence and the web platform.

For web developers, the focus has expanded beyond cloud-hosted model endpoints. The industry is seeing a shift toward on-device AI execution, allowing developers to run lightweight LLMs directly inside the client browser.

This article reviews the key web-focused AI announcements from Google I/O 2025 and explains how they will influence frontend application architecture.

Defense Principles of XSS in Web Development

Tue, 25 Feb 2025 00:00:00 +0900

Introduction

In web security, Cross-Site Scripting (XSS) stands as one of the oldest and most persistent vulnerabilities.

If malicious scripts run on a victim’s browser, they can compromise the entire session, steal session tokens (cookies), hijack accounts, or dynamically alter page content to harvest sensitive credentials.

This article reviews the fundamental defense principles required to eliminate XSS vulnerabilities in modern web applications. We will explore contextual escaping, sanitization, secure DOM manipulation, and defensive depth mechanisms.

Introduction to CSS Anchor Positioning and Examples

Mon, 10 Feb 2025 00:00:00 +0900

Introduction

In web development, positioning floating elements—such as tooltips, popovers, dropdown menus, and hover cards—relative to a specific reference element (the anchor) has historically been a complex challenge.

To make floating elements follow anchor points on window resizing or page scrolling, developers traditionally relied on continuous JavaScript coordinate calculations (using getBoundingClientRect()) to dynamically alter inline styles. Libraries like Popper.js or Floating UI became industry standards for this reason. However, executing script loops on the main thread during scroll events frequently caused rendering 렉 and jank, especially on mobile devices.

Task Management Tools for Beginners: Choosing the Right One

Tue, 14 Jan 2025 00:00:00 +0900

Hello! Today, I will explain “how to choose a task management tool” to manage your daily tasks more efficiently. It is very important to organize “things to do” in your daily life, whether it is work, schoolwork, or housework. But finding the right tool for you may be a bit difficult. So, here are some 팁 for 초보자 to help you choose the right one without hesitation!

Cloudflare Pages: Static Site Hosting Guide

Tue, 28 Nov 2023 00:00:00 +0900

Cloudflare Pages: Static Site Hosting for Modern Websites

Introduction

Cloudflare Pages is a static site hosting platform built on top of Cloudflare’s global 네트워크 infrastructure. It combines the speed of a world-class CDN with an intuitive 배포 pipeline, making it an excellent choice for developers who want to focus on building rather than configuring servers. From portfolio sites to full-featured web applications, Cloudflare Pages handles the heavy lifting of content delivery, SSL termination, and scaling — all with a generous free tier. This 가이드 walks through every step of 설정 up and optimizing a site on Cloudflare Pages.

Cloudflare Setup Guide: Security and Performance

Tue, 28 Nov 2023 00:00:00 +0900

Cloudflare Setup: Improving Website Security and 성능

Introduction

For any website owner, security and speed are two sides of the same coin. A slow site frustrates visitors and hurts conversions; an insecure site puts data and reputation at risk. Cloudflare addresses both challenges with an integrated platform that sits between your visitors and your origin 서버, acting as a reverse proxy, content delivery 네트워크, and security gateway all at once. This 가이드 walks through configuring Cloudflare’s core 기능 — from basic DNS setup to advanced security rules — so you can protect and accelerate your site with confidence.

Google Analytics: Implementation and Analytics Guide

Fri, 20 Oct 2023 00:00:00 +0900

Google Analytics: Implementation and Analytics 가이드

Understanding how visitors interact with your website is essential for growth. Google Analytics (GA) is the industry standard for web analytics, providing deep insights into traffic sources, user behavior, and conversion 성능. This 가이드 walks through the complete implementation process, from 계정 creation to advanced 최적화, so you can start making data-driven decisions with confidence.

OWASP ZAP: Web Application Security Testing Guide

Fri, 20 Oct 2023 00:00:00 +0900

OWASP ZAP: Web Application Security Testing 가이드

Web application security is no longer optional — it is a fundamental requirement for protecting user data and maintaining trust. OWASP ZAP (Zed Attack Proxy) is one of the most popular open-source security testing tools available. It helps developers and security professionals identify vulnerabilities in web applications through automated scanning and manual testing 기능. This 가이드 covers the full workflow, from 설치 to remediation.

Wayback Machine: Exploring the Internet Archive

Mon, 11 Sep 2023 00:00:00 +0900

Wayback Machine: Exploring the Internet Archive

The Wayback Machine is a digital time capsule for the World Wide Web. Operated by the Internet Archive, a non-profit organization founded in 1996, it preserves snapshots of web pages across decades, allowing anyone to travel back in time and see what websites looked like years ago. Whether you are conducting research, recovering lost content, or simply curious about the internet’s history, the Wayback Machine is an indispensable tool.

How to Set Up Hugo: Complete Guide for Beginners

Wed, 23 Aug 2023 00:00:00 +0900

How to install Hugo - Static Site Generator 설치 Instructions

Hugo is a fast and simple static site generator and tool that makes building websites easy. This article details the steps to install Hugo.

Step 1: 다운로드 Hugo

To install Hugo, first 다운로드 the appropriate 버전 of the Hugo binary from the official 다운로드 page.

go to the official Hugo 다운로드 page. 2.
select the 설치 method appropriate for your operating system (Windows, macOS, Linux, etc.)
open a terminal (command prompt) and follow the instructions to 다운로드 the Hugo binary.

Step 2: Confirm 설치

After the Hugo binary has been downloaded, verify that the 설치 was successful. 1.