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Jangwook Kim

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Official GEO is a subtraction list plus one Search Console switch
jangwook_kim_e31e7291ad98 profile

Official GEO is a subtraction list plus one Search Console switch

#seo #geo #aio #searchconsole
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10 min read
The gpt-5 Alias Points at a Model OpenAI Deletes Dec 11
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The gpt-5 Alias Points at a Model OpenAI Deletes Dec 11

#openai #modeldeprecation #migration #apiaudit
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9 min read
Three of ten never became an element: where robots meta actually lands
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Three of ten never became an element: where robots meta actually lands

#seo #crawling #html #webdev
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10 min read
CSS Cannot Hear the Escape Key: Seven Tooltips Against SC 1.4.13
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CSS Cannot Hear the Escape Key: Seven Tooltips Against SC 1.4.13

#a11y #wcag #css #frontend
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11 min read
The markup said 'read this aloud' and pointed at 13 paragraphs
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The markup said 'read this aloud' and pointed at 13 paragraphs

#structureddata #seo #jsonld #webdev
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8 min read
Chrome's agent skill: 138 guides, 2 on a11y, 0 on search
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Chrome's agent skill: 138 guides, 2 on a11y, 0 on search

#webdev #aiagents #a11y #structureddata
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11 min read
Your Prompt Tooling Has a Deadline Your Monitoring Can't See
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Your Prompt Tooling Has a Deadline Your Monitoring Can't See

#openai #anthropic #deprecation #migration
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10 min read
How to Self-Host n8n with Docker — AI Workflow Automation Guide 2026
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How to Self-Host n8n with Docker — AI Workflow Automation Guide 2026

#n8n #selfhosting #docker #aiworkflow
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18 min read
Best Open Source AI Tools for Developers: Evidence Matrix
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Best Open Source AI Tools for Developers: Evidence Matrix

#opensourceai #developertools #localinference #codingagents
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9 min read
Best AI DevOps Tools 2026: From CI/CD to Deployment Automation
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Best AI DevOps Tools 2026: From CI/CD to Deployment Automation

#aidevops #cicd #deploymentautomation #infrastructureascode
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14 min read
Best AI Coding Agents 2026: Comprehensive Comparison & Rankings
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Best AI Coding Agents 2026: Comprehensive Comparison & Rankings

#aicodingagents #claudecode #devin #githubcopilot
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16 min read
AI Agent Frameworks Compared 2026: LangGraph vs CrewAI vs OpenAI SDK
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AI Agent Frameworks Compared 2026: LangGraph vs CrewAI vs OpenAI SDK

#aiagents #langgraph #crewai #openaiagentssdk
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17 min read
A 320px reflow test covers half of it: the 200px height at 400% zoom
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A 320px reflow test covers half of it: the 200px height at 400% zoom

#a11y #wcag #css #responsive
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12 min read
Quote-level deep links break only inside code blocks
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Quote-level deep links break only inside code blocks

#geo #seo #semantichtml #webstandards
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9 min read
I Widened Letter Spacing by 0.12em and 570 Elements Clipped
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I Widened Letter Spacing by 0.12em and 570 Elements Clipped

#a11y #wcag #css #i18n
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11 min read
axe-core vs W3C's ACT Answer Key: 37.5% of Failures Caught
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axe-core vs W3C's ACT Answer Key: 37.5% of Failures Caught

#a11y #wcag #ci #testing
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11 min read
Zero Failures Tabbing Down, 16 Tabbing Up: The Sticky Header Problem
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Zero Failures Tabbing Down, 16 Tabbing Up: The Sticky Header Problem

#a11y #wcag #keyboard #css
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12 min read
Your Last Deploy Reset Every Cache Validator on the Site
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Your Last Deploy Reset Every Cache Validator on the Site

#seo #crawling #httpcaching #statichosting
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14 min read
What a 26-page WCAG-EM sample missed across 1,342 built pages
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What a 26-page WCAG-EM sample missed across 1,342 built pages

#a11y #wcag #webdev #auditing
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12 min read
I Authored Six of the Seven Places My Title Is Declared
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I Authored Six of the Seven Places My Title Is Declared

#seo #a11y #anchortext #structureddata
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12 min read
24,948 of My 46,382 Internal Links Pointed at a 301
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24,948 of My 46,382 Internal Links Pointed at a 301

#seo #internallinking #redirects #canonical
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9 min read
I removed one archive page and 296 posts became unreachable
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I removed one archive page and 296 posts became unreachable

#seo #internallinking #crawlability #informationarchitecture
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10 min read
What a div grid quietly loses: measuring the a11y tree and text extraction on the same table
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What a div grid quietly loses: measuring the a11y tree and text extraction on the same table

#a11y #semantichtml #geo #wcag
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10 min read
OpenAI Spend Limits Return 429: Your Retry Logic Will Make It Worse
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OpenAI Spend Limits Return 429: Your Retry Logic Will Make It Worse

#openai #apireliability #costcontrol #errors
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11 min read
Why Prerendered LCP Reads 6.2s Without activationStart
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Why Prerendered LCP Reads 6.2s Without activationStart

#performance #corewebvitals #webdev #chrome
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9 min read
Why I Re-Run My Injection Tests Every Time I Bump the Model
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Why I Re-Run My Injection Tests Every Time I Bump the Model

#security #llm #webdev #cicd
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11 min read
Your AI Gateway Blocked the Request. Did You Still Pay?
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Your AI Gateway Blocked the Request. Did You Still Pay?

#openrouter #aigateway #finops #governance
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9 min read
WebMCP's Origin Trial: provideContext Is Already Gone
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WebMCP's Origin Trial: provideContext Is Already Gone

#webmcp #agents #chrome #webdev
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8 min read
FAQ Rich Results Are Dead. Don't Delete the Q&A Markup
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FAQ Rich Results Are Dead. Don't Delete the Q&A Markup

#seo #structureddata #jsonld #geo
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7 min read
WebSockets No Longer Block bfcache? Chrome 150 Still Said 'websocket'
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WebSockets No Longer Block bfcache? Chrome 150 Still Said 'websocket'

#performance #corewebvitals #webdev #chrome
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9 min read
OpenAI Output Moderation: What the Scores Actually Catch
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OpenAI Output Moderation: What the Scores Actually Catch

#openai #contentmoderation #aisafety #responsesapi
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8 min read
aria-modal="true" Blocked Nothing: Modal Focus Escape, Measured
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aria-modal="true" Blocked Nothing: Modal Focus Escape, Measured

#a11y #wcag #webdev
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7 min read
Restaurant JSON-LD: Nobody Catches opens: "eleven"
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Restaurant JSON-LD: Nobody Catches opens: "eleven"

#seo #structureddata #localseo #jsonld
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9 min read
One listener costs you the back button: six bfcache probes
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One listener costs you the back button: six bfcache probes

#performance #corewebvitals #webdev #chrome
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9 min read
1,248 Feed Items, Four Languages, Zero Language Metadata
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1,248 Feed Items, Four Languages, Zero Language Metadata

#i18n #w3c #webdev
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12 min read
GPT-5.6 Prompt Caching: The 24-Hour Cache Is Gone
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GPT-5.6 Prompt Caching: The 24-Hour Cache Is Gone

#openai #promptcaching #gpt56 #apicost
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10 min read
WCAG 2.2 Minimum Target Size: the AA Failure Hiding Behind a Green 92
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WCAG 2.2 Minimum Target Size: the AA Failure Hiding Behind a Green 92

#a11y #wcag #webdev
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9 min read
The meta Line That Decides If AI Overviews Can Quote You
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The meta Line That Decides If AI Overviews Can Quote You

#seo #geo #aioverview #structureddata
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8 min read
content-visibility Measured: One CSS Line, 15x Less Forced Layout
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content-visibility Measured: One CSS Line, 15x Less Forced Layout

#corewebvitals #css #webperf #rendering
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8 min read
When an AI Agent Bungles a Tool Call, Does It Fix Itself?
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When an AI Agent Bungles a Tool Call, Does It Fix Itself?

#agentreliability #tooluse #businessautomation #apibackedlab
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8 min read
Measuring INP: one click cost 264ms, chunking it got 56ms
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Measuring INP: one click cost 264ms, chunking it got 56ms

#corewebvitals #inp #webperf
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10 min read
Cutting CLS from 0.559 to 0.014, measured
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Cutting CLS from 0.559 to 0.014, measured

#corewebvitals #cls #webperf #a11y
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8 min read
GPT-5.6 Programmatic Tool Calling: When It Cuts the Token Bill
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GPT-5.6 Programmatic Tool Calling: When It Cuts the Token Bill

#gpt56 #programmatictoolcalling #tokencost #aifinops
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8 min read
A 117KB hero with a 1.2s LCP: the browser found it too late
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A 117KB hero with a 1.2s LCP: the browser found it too late

#corewebvitals #lcp #webperf #rendering
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8 min read
Catch Broken JSON-LD in CI Before It Ships
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Catch Broken JSON-LD in CI Before It Ships

#structureddata #jsonld #ci #seo
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8 min read
Claude Programmatic Tool Calling: Measured Token Savings
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Claude Programmatic Tool Calling: Measured Token Savings

#claude #programmatictoolcalling #tokencost #aifinops
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9 min read
AI Consumer Research: Validation Priorities, Not Market Truth
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AI Consumer Research: Validation Priorities, Not Market Truth

#airesearch #marketresearch #syntheticpanels #productvalidation
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11 min read
Can an AI Agent Finish Orders When a Tool Fails?
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Can an AI Agent Finish Orders When a Tool Fails?

#agentreliability #businessautomation #proofstudio
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8 min read
Goose by Block: A Free, Open-Source AI Agent Review 2026
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Goose by Block: A Free, Open-Source AI Agent Review 2026

#opensource #agents #mcp #developertools
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13 min read
GitHub Copilot Agent Mode in JetBrains IDEs: 2026 Guide
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GitHub Copilot Agent Mode in JetBrains IDEs: 2026 Guide

#githubcopilot #jetbrains #agentmode #aicoding
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15 min read
What Automated Accessibility Checks Miss After the Green Light
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What Automated Accessibility Checks Miss After the Green Light

#a11y #wcag #webdev
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11 min read
JSON-LD vs Microdata vs RDFa: Which Structured Data Syntax, and Why
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JSON-LD vs Microdata vs RDFa: Which Structured Data Syntax, and Why

#structureddata #jsonld #seo #webdev
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8 min read
A wrong accessible name breaks voice control and AI agents
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A wrong accessible name breaks voice control and AI agents

#a11y #wcag #geo
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9 min read
Web-Search Agents Waste Tokens: We Measured How Much
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Web-Search Agents Waste Tokens: We Measured How Much

#agenticsearch #tokencost #aifinops #llmtools
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8 min read
AI Crawlers Don't Run Your JavaScript
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AI Crawlers Don't Run Your JavaScript

#geo #seo #ssr #aicrawler
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8 min read
In sitemap.xml, lastmod Is the Only Field Google Actually Reads
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In sitemap.xml, lastmod Is the Only Field Google Actually Reads

#seo #sitemaps #crawling #webdev
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8 min read
OpenAI Models on Bedrock: A Responses API Readiness Check
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OpenAI Models on Bedrock: A Responses API Readiness Check

#openai #amazonbedrock #responsesapi #gpt55
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9 min read
Why color-contrast Disappears When You Put axe-core in CI
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Why color-contrast Disappears When You Put axe-core in CI

#a11y #axecore #wcag #ci
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8 min read
I Ran a Technical SEO Audit for Five Days: the Gates Mattered More Than the Five Fixes
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I Ran a Technical SEO Audit for Five Days: the Gates Mattered More Than the Five Fixes

#technicalseo #webdev #hreflang #structureddata
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8 min read
OpenAI Assistants API Shutdown: Port Your Bot Before Aug 26
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OpenAI Assistants API Shutdown: Port Your Bot Before Aug 26

#openai #assistantsapi #responsesapi #migration
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9 min read
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