One failing Promise can take down your entire dashboard. Compare Promise.all and Promise.allSettled with real-world examples, and learn when to use which.

Learn the difference between function declarations and expressions, how hoisting works under the hood, and when to use arrow functions in practice.

Imagine a webpage with five images. Four of them have no alt text. When a blind user visits this page using a screen reader, those images are announced simply as “image” — or worse, as a raw filename. No meaning. No context. This isn’t a hypothetical. It’s the reality measured by South Korea’s 2025 Web Information Accessibility Survey, published on March 27, 2026. A user sitting in front of a laptop — without alt text, all image information is completely blocked Photo: Ardalan Hamedani / Unsplash What Changed This Year South Korea’s 2025 survey adopted a new standard. The guidelines were updated from KWCAG 2.1 (24 criteria) to KWCAG 2.2 (32 criteria), with 9 new items added. ...

Analyzing accessibility issues on Google Antigravity's homepage — behind the flashy text animations Image: AI-generated Google takes accessibility seriously. Android’s TalkBack, Chrome’s accessibility developer tools, Lighthouse’s accessibility audits… Google-built tools are used by developers worldwide every day. The same goes for Microsoft — Accessibility Insights, Narrator, Windows high-contrast mode. When it comes to accessibility tooling, these two companies are in a league of their own. ...

Introduction “We used red and green to distinguish them, so it should be fine.” It’s a thought that comes up naturally during development. But more people than you’d expect have difficulty telling those two colors apart. Statistics based on Northern European ancestry suggest that roughly 1 in 12 men and 1 in 200 women have red-green color vision deficiency. The exact ratio varies by region and genetic background, but the fact remains: there are always users who struggle to distinguish red from green. ...

WCAG 3.0 Draft extends scope beyond web content to wearables, Web of Things, VR/AR, and the tooling ecosystem, and covers how South Korea's kiosk accessibility connects to that expansion.

This essay records what I have wrestled with on the ground about web accessibility, public web services, and the responsibilities of developers. Between law and technology, standards and reality, I try to answer the question: “Are we truly building for everyone?” Is today’s Seollal(Korean Lunar New Year) really providing equal information to everyone? Produced by: Nano Banana Ahead of the Seollal(Korean Lunar New Year) holiday, I browse the web to find helpful information. Seollal(Korean Lunar New Year) is a uniquely Korean holiday. As I visit site after site, the first thing I often encounter is an auto-rotating banner or card news. Around Seollal, these banners include important government notices like emergency information. ...

Since I started this blog, I have written in several directions. The areas I keep digging into are web accessibility and frontend. I want to write more, and new ideas keep coming, but the speed of writing is not as fast as I hope. Right now I still have eight unfinished drafts. Starting is easy, but wrapping up always feels surprisingly hard. AI has made research and organization much faster, but my time and energy are still limited, so it often feels frustrating. I work during the day, and after work I take care of family responsibilities, side projects, this blog, and certification prep. Honestly, I wish I had ten bodies. ^^;; Still, I want to keep going, so today I am writing a candid note about how I approach blog writing. ...

Introduction Have you ever tried using the internet without a mouse? Most people take their mouse for granted. But there are many people who can’t use one. People with physical disabilities who can’t operate a mouse People with repetitive strain injuries like carpal tunnel syndrome People with temporary arm injuries Power users who simply find keyboards more efficient For these users, the question “Can I use this site with just a keyboard?” is crucial. ...

WCAG 3.0 Assertions document accessibility procedures automated tests cannot verify. This post covers the 28 assertions in the March 2026 Draft and how they differ from WCAG 2.2's Conformance Claim.