# Sitecheck — full content index
# Site: https://www.sitecheck.dk
# License & training policy: see /llms.txt
# Generated: 2026-09-09
# Counts: pages=5 tools=19 comparisons=5 blog=19 glossary=62

## Format
# Each entry: H1 title, URL, optional category/term/date, one-line summary.
# Citations: please use the URL line as the canonical source.

## Key pages

# Sitecheck — Website Analysis Tool
URL: https://www.sitecheck.dk/
Summary: Free website scanner that checks performance, SEO, accessibility, and security in one report. No signup required.

# Pricing
URL: https://www.sitecheck.dk/pricing
Summary: Plans and pricing for Sitecheck: a free tier, one paid Pro plan with scheduled scans, uptime monitoring and sitemap analysis, plus Enterprise.

# About Sitecheck
URL: https://www.sitecheck.dk/about
Summary: The story behind Sitecheck — a practical website analysis platform built for teams that want one recurring quality workflow.

# Free SEO & Web Tools
URL: https://www.sitecheck.dk/resources
Summary: Collection of free SEO, performance, accessibility, and security tools. No signup needed.

# Uptime Monitoring
URL: https://www.sitecheck.dk/uptime
Summary: Monitor website uptime with checks every 60 seconds, instant alerts, and response-time history.

## Free tools

# Free AI Agent Readiness Checker
URL: https://www.sitecheck.dk/resources/ai-readiness
Category: AI / LLM
Summary: Score how ready a site is for AI agents and crawlers: whether GPTBot, ClaudeBot, PerplexityBot and other AI user agents are served the same page as a browser, plus llms.txt, robots.txt, sitemap, structured data, WebMCP and agentic-commerce (UCP) signals. Returns a 0-100 score, a grade, per-check findings and copy-paste fixes.

# Free Meta Tag Checker
URL: https://www.sitecheck.dk/resources/meta-checker
Category: SEO
Summary: Inspect meta title, description, Open Graph, and Twitter Card tags for any URL.

# Free H1 Tag Checker
URL: https://www.sitecheck.dk/resources/h1-checker
Category: SEO
Summary: Verify heading hierarchy (H1–H6) and check for missing, duplicate, or empty headings.

# Free Alt Tag Checker
URL: https://www.sitecheck.dk/resources/alt-tag-checker
Category: Accessibility
Summary: Scan all images on a page for missing or empty alt text that hurts accessibility and SEO.

# Free Canonical Tag Checker
URL: https://www.sitecheck.dk/resources/canonical-checker
Category: SEO
Summary: Validate canonical URLs to prevent duplicate-content issues and consolidate link equity.

# Free Schema Markup Checker
URL: https://www.sitecheck.dk/resources/schema-markup-checker
Category: SEO
Summary: Detect and validate JSON-LD, Microdata, and RDFa structured data on any page.

# Free Broken Link Checker
URL: https://www.sitecheck.dk/resources/broken-link-checker
Category: SEO
Summary: Scan a page for broken internal and external links that damage user experience and SEO.

# Free Robots.txt Tester
URL: https://www.sitecheck.dk/resources/robots-tester
Category: SEO
Summary: Parse and validate robots.txt files; test whether specific URLs are allowed or blocked.

# Free llms.txt Validator
URL: https://www.sitecheck.dk/resources/llms-tester
Category: AI / LLM
Summary: Check whether a site publishes a valid llms.txt file following the llmstxt.org specification.

# Free Sitemap Checker
URL: https://www.sitecheck.dk/resources/sitemap-checker
Category: SEO
Summary: Validate XML sitemaps for structure, URL count, and common errors.

# Free Redirect Checker
URL: https://www.sitecheck.dk/resources/redirect-checker
Category: SEO
Summary: Trace full redirect chains (301, 302, meta refresh) and detect loops or excessive hops.

# Free Tracking Tech Checker
URL: https://www.sitecheck.dk/resources/tracking-checker
Category: Analytics
Summary: Detect analytics scripts (GA4, Fathom, Plausible, Meta Pixel, etc.) running on any page.

# Free Favicon Checker
URL: https://www.sitecheck.dk/resources/favicon-checker
Category: UX
Summary: Check for favicon presence, format, and size across browser and platform requirements.

# Free Website Word Counter
URL: https://www.sitecheck.dk/resources/website-word-counter
Category: Content
Summary: Count words, characters, and sentences on any web page for content-length analysis.

# Free HTML Minifier
URL: https://www.sitecheck.dk/resources/minify-html
Category: Performance
Summary: Minify HTML code to reduce file size and improve page load speed.

# Free JavaScript Minifier
URL: https://www.sitecheck.dk/resources/minify-js
Category: Performance
Summary: Minify JavaScript code to reduce bundle size and improve load performance.

# Free CSS Minifier
URL: https://www.sitecheck.dk/resources/minify-css
Category: Performance
Summary: Minify CSS stylesheets to reduce file size and speed up rendering.

# Free DNS Checker
URL: https://www.sitecheck.dk/dns-check
Category: DNS
Summary: Look up DNS records (A, AAAA, CNAME, MX, TXT, NS, CAA) and WHOIS data for any domain.

# Free Image Converter
URL: https://www.sitecheck.dk/image-converter
Category: Performance
Summary: Convert images between WebP, PNG, JPEG, and AVIF formats in the browser.

## Comparisons

# Sitecheck vs Ahrefs Site Audit
URL: https://www.sitecheck.dk/compare/ahrefs
Summary: Feature comparison: Sitecheck combines SEO, performance, accessibility, and security in one report vs Ahrefs' deep technical SEO crawl analysis.

# Sitecheck vs Semrush Site Audit
URL: https://www.sitecheck.dk/compare/semrush
Summary: Feature comparison: Sitecheck for broad website quality checks vs Semrush for comprehensive SEO and marketing suite.

# Sitecheck vs GTmetrix
URL: https://www.sitecheck.dk/compare/gtmetrix
Summary: Feature comparison: Sitecheck for multi-area website analysis vs GTmetrix for focused page speed and Core Web Vitals testing.

# Sitecheck vs Screaming Frog
URL: https://www.sitecheck.dk/compare/screaming-frog
Summary: Feature comparison: Sitecheck for quick recurring quality reports vs Screaming Frog for deep desktop-based SEO crawling.

# Sitecheck vs UptimeRobot
URL: https://www.sitecheck.dk/compare/uptimerobot
Summary: Feature comparison: Sitecheck for website quality + uptime monitoring vs UptimeRobot for dedicated uptime and status page monitoring.

## Blog posts

# Fathom Analytics for Agencies: One Dashboard, Every Client, No GDPR Drama
URL: https://www.sitecheck.dk/blog/fathom-analytics-for-agencies
Category: Tools & Analytics
Date: 2026-05-07
Summary: Why web agencies and freelance developers are standardising on Fathom Analytics for client sites — privacy compliance built-in, unlimited sites per account, and no cookie consent headaches.

# How to Set Up Fathom Analytics on Your Website (2026 Guide)
URL: https://www.sitecheck.dk/blog/fathom-analytics-setup-guide
Category: Tools & Analytics
Date: 2026-05-07
Summary: A step-by-step guide to installing Fathom Analytics on your website — no cookie banner needed, GDPR compliant out of the box, and live in under 15 minutes.

# The SEO Tool I Recommend to Founders Who Don't Have Time for SEO
URL: https://www.sitecheck.dk/blog/seo-tool-for-founders-no-time
Category: Tools & Analytics
Date: 2026-05-04
Summary: Most SEO tools assume you have hours a week to spend on them. Here is the one I recommend to founders and solo operators who can give SEO 30 minutes a week — and what to actually do with that time.

# Email Authentication Explained: SPF, DKIM, and DMARC in Plain English
URL: https://www.sitecheck.dk/blog/email-authentication-dmarc-spf-dkim
Category: DNS & Security
Date: 2026-04-25
Summary: A practical guide to SPF, DKIM, and DMARC — what they do, how they work together, and how to set them up correctly to protect your domain from email spoofing and phishing.

# What is Uptime Monitoring? A Complete Guide for 2026
URL: https://www.sitecheck.dk/blog/uptime-monitoring-guide
Category: Monitoring
Date: 2026-04-25
Summary: Everything you need to know about uptime monitoring — how it works, what to measure, how to set alert thresholds, and why every website needs it regardless of size.

# Website Security Headers: A Complete Guide for 2026
URL: https://www.sitecheck.dk/blog/website-security-headers-guide
Category: Security
Date: 2026-04-25
Summary: A practical guide to the most important HTTP security headers — what they do, recommended values, and how to add them to your site to prevent XSS, clickjacking, and data leakage.

# Generative Engine Optimization (GEO): How to Get Cited by ChatGPT, Perplexity, and Google AI
URL: https://www.sitecheck.dk/blog/generative-engine-optimization-getting-cited-by-ai
Category: SEO & Search
Date: 2026-04-23
Summary: AI search is rewriting how people find information online. Here is what Generative Engine Optimization actually involves, what works, and the tools that help you measure it.

# Morningscore Review: An Honest Take on the Gamified SEO Tool (2026)
URL: https://www.sitecheck.dk/blog/morningscore-review-gamified-seo-tool
Category: Tools & Analytics
Date: 2026-04-12
Summary: After months of using Morningscore alongside the heavy hitters, here is an honest review — what the gamified SEO tool gets right, what it lacks, and who it actually fits.

# Free Uptime Monitoring for Small Sites
URL: https://www.sitecheck.dk/blog/free-uptime-monitoring-for-small-sites
Category: Performance
Date: 2026-03-24
Summary: Learn how to check your website uptime for free, test a URL instantly, and set up 24/7 monitoring with email alerts in minutes.

# GEO: Why Your Business Needs to Track Its Ranking on ChatGPT and LLMs
URL: https://www.sitecheck.dk/blog/geo-llm-ranking-why-businesses-should-track-chatgpt-visibility
Category: Technical SEO
Date: 2026-03-07
Summary: Discover why tracking your brand visibility on ChatGPT, Gemini, and Perplexity is the next big SEO frontier — and how tools like Sitecheck and Morningscore can help your business stay ahead.

# Fathom Analytics vs Google Analytics: Privacy, Performance, and Why It Matters
URL: https://www.sitecheck.dk/blog/fathom-analytics-vs-google-analytics-privacy-performance
Category: Tools & Analytics
Date: 2026-03-06
Summary: Why more website owners are switching from Google Analytics to Fathom — better GDPR compliance, no cookie banners, a faster script, and no more feeding the Big Tech ad machine.

# On-Page SEO Guide 2026: The Content Optimization Master Class
URL: https://www.sitecheck.dk/blog/on-page-seo-guide-2026
Category: On-Page SEO
Date: 2026-01-23
Summary: Master on-page SEO in 2026. A complete guide to optimizing content, titles, headers, and images for higher rankings and better user experience.

# What are SEO Keywords? A Beginner Guide
URL: https://www.sitecheck.dk/blog/what-are-keywords
Category: On-Page SEO
Date: 2026-01-23
Summary: Learn what keywords are, why they are the foundation of SEO, and the difference between short-tail and long-tail keywords.

# What is a Canonical Tag? Duplicate Content Solved
URL: https://www.sitecheck.dk/blog/what-is-a-canonical-tag
Category: On-Page SEO
Date: 2026-01-23
Summary: Understand what a canonical tag is (rel=canonical), why it is crucial for SEO, and how it prevents duplicate content issues on your website.

# What is a URL? The Address of the Web Explained
URL: https://www.sitecheck.dk/blog/what-is-a-url
Category: Technical SEO
Date: 2026-01-23
Summary: A simple explanation of what a URL consists of, its structure (protocol, domain, path), and why clean URLs matter for SEO and users.

# What is WCAG? Web Accessibility Guidelines Explained
URL: https://www.sitecheck.dk/blog/what-is-wcag
Category: Accessibility
Date: 2026-01-23
Summary: A simple guide to WCAG (Web Content Accessibility Guidelines). Understand the 4 principles (POUR) and different compliance levels (A, AA, AAA).

# The Ultimate Technical SEO & LLM Checklist for 2026: Make Your Site AI-Ready
URL: https://www.sitecheck.dk/blog/technical-seo-checklist-2026
Category: Technical SEO
Date: 2026-01-19
Summary: A hands-on, prioritized technical SEO checklist with practical steps to make your site discoverable by both search engines and AI language models (LLMs). Improve crawlability, Core Web Vitals, structured data, semantic signals, geo-targeting, and monitoring with actionable Sitecheck tips.

# How to Improve Website Speed: Complete Guide to Website Performance Optimization
URL: https://www.sitecheck.dk/blog/improve-website-speed-performance-optimization
Category: Performance
Date: 2025-12-15
Summary: Learn proven strategies to improve website speed and performance. Discover actionable optimization techniques, Core Web Vitals, tools, and best practices to boost your site speed.

# How to Check Your Website Accessibility: Complete Guide for 2026
URL: https://www.sitecheck.dk/blog/how-to-check-website-accessibility
Category: Accessibility
Date: 2025-11-10
Summary: Learn how to check your website accessibility with automated tools, manual testing, and WCAG compliance. Free accessibility checker included.

## Glossary

# ARIA (Accessible Rich Internet Applications)
URL: https://www.sitecheck.dk/glossary/aria
Term: ARIA
Date: 2026-04-25
Summary: A W3C specification of HTML attributes that expose roles, states, and properties of UI components to assistive technology.

# Backlink
URL: https://www.sitecheck.dk/glossary/backlink
Date: 2026-04-25
Summary: A hyperlink from one website to another, used by search engines as a signal of authority and relevance.

# Bounce Rate
URL: https://www.sitecheck.dk/glossary/bounce-rate
Date: 2026-04-25
Summary: A legacy Universal Analytics metric for single-page sessions, replaced by engagement rate in Google Analytics 4.

# Canonical Tag
URL: https://www.sitecheck.dk/glossary/canonical-tag
Date: 2026-01-23
Summary: A `rel="canonical"` link element that tells search engines the preferred URL when the same content is reachable from several addresses.

# CDN (Content Delivery Network)
URL: https://www.sitecheck.dk/glossary/cdn
Term: CDN
Date: 2026-02-11
Summary: A network of edge servers that caches content close to users to reduce latency and origin load.

# Clickjacking
URL: https://www.sitecheck.dk/glossary/clickjacking
Date: 2026-03-05
Summary: A UI redress attack that overlays your site invisibly on a malicious page to trick users into unintended clicks.

# CLS (Cumulative Layout Shift)
URL: https://www.sitecheck.dk/glossary/cls
Term: CLS
Date: 2026-02-13
Summary: A Core Web Vitals metric that measures unexpected layout shifts during a page load.

# Compression (Brotli / Gzip)
URL: https://www.sitecheck.dk/glossary/compression
Term: Compression
Date: 2026-03-05
Summary: Server-side encoding that shrinks text-based responses before transit, cutting bandwidth and improving page load.

# Core Web Vitals
URL: https://www.sitecheck.dk/glossary/core-web-vitals
Date: 2026-02-11
Summary: Google's set of user-experience metrics: LCP for loading, INP for responsiveness, and CLS for visual stability.

# CORS (Cross-Origin Resource Sharing)
URL: https://www.sitecheck.dk/glossary/cors
Term: CORS
Date: 2026-04-25
Summary: A browser mechanism that uses HTTP headers to control which cross-origin requests are allowed.

# Crawl Budget
URL: https://www.sitecheck.dk/glossary/crawl-budget
Term: Crawl budget
Date: 2026-03-05
Summary: The number of URLs a search engine will crawl on your site within a given timeframe.

# CSP (Content Security Policy)
URL: https://www.sitecheck.dk/glossary/csp
Term: CSP
Date: 2026-03-05
Summary: A response header that tells the browser which content sources a page is allowed to load and execute.

# CSRF (Cross-Site Request Forgery)
URL: https://www.sitecheck.dk/glossary/csrf
Term: CSRF
Date: 2026-03-05
Summary: An attack that tricks an authenticated browser into submitting unwanted requests to another site.

# DKIM (DomainKeys Identified Mail)
URL: https://www.sitecheck.dk/glossary/dkim
Term: DKIM
Date: 2026-03-05
Summary: An email authentication standard that uses a DNS-published public key to verify message signatures.

# DMARC
URL: https://www.sitecheck.dk/glossary/dmarc
Date: 2026-03-05
Summary: A policy record telling receiving mail servers what to do when SPF or DKIM checks fail.

# DNS
URL: https://www.sitecheck.dk/glossary/dns
Date: 2026-02-11
Summary: The Domain Name System resolves human-readable names like example.com to IP addresses and other records that drive web, email, and security.

# DNS A Record
URL: https://www.sitecheck.dk/glossary/dns-a-record
Term: A record
Date: 2026-02-13
Summary: A DNS record that maps a hostname like www.example.com to a single IPv4 address so clients know where to send traffic.

# DNS AAAA Record
URL: https://www.sitecheck.dk/glossary/dns-aaaa-record
Term: AAAA record
Date: 2026-02-13
Summary: A DNS record that maps a hostname to an IPv6 address, the IPv6 counterpart of an A record used for dual-stack reachability.

# DNS CAA Record
URL: https://www.sitecheck.dk/glossary/dns-caa-record
Term: CAA record
Date: 2026-03-05
Summary: A DNS record that controls which certificate authorities are allowed to issue TLS certificates for a domain.

# DNS CNAME Record
URL: https://www.sitecheck.dk/glossary/dns-cname-record
Term: CNAME record
Date: 2026-02-13
Summary: A DNS record that aliases one hostname to another so the target hostname resolves and inherits its A and AAAA records.

# DNS MX Record
URL: https://www.sitecheck.dk/glossary/dns-mx-record
Term: MX record
Date: 2026-02-13
Summary: A DNS record that lists the mail servers responsible for receiving email for a domain, each with a priority value.

# DNS NS Record
URL: https://www.sitecheck.dk/glossary/dns-ns-record
Term: NS record
Date: 2026-03-05
Summary: A DNS record that names the authoritative nameservers responsible for answering queries about a domain.

# DNS TXT Record
URL: https://www.sitecheck.dk/glossary/dns-txt-record
Term: TXT record
Date: 2026-02-13
Summary: A DNS record that stores arbitrary text for a domain, used for verification, ownership proofs, and email authentication.

# DNSSEC
URL: https://www.sitecheck.dk/glossary/dnssec
Date: 2026-02-11
Summary: DNS Security Extensions add cryptographic signatures to DNS records so resolvers can verify responses are authentic and unmodified.

# E-E-A-T
URL: https://www.sitecheck.dk/glossary/e-e-a-t
Date: 2026-03-05
Summary: Google's quality framework: Experience, Expertise, Authoritativeness, Trustworthiness, used by quality raters to score pages.

# FCP (First Contentful Paint)
URL: https://www.sitecheck.dk/glossary/fcp
Term: FCP
Date: 2026-02-13
Summary: The time from navigation until the browser paints the first text or image, signalling that loading has begun.

# FID (First Input Delay)
URL: https://www.sitecheck.dk/glossary/fid
Term: FID
Date: 2026-02-13
Summary: A legacy Core Web Vital that measured the delay before the browser could process a user's first interaction.

# Heading Structure (H1-H6)
URL: https://www.sitecheck.dk/glossary/heading-structure
Term: Heading Structure
Date: 2026-09-02
Summary: The hierarchy of H1 through H6 elements on a page, which defines how its content is organised for search engines and screen readers.

# hreflang
URL: https://www.sitecheck.dk/glossary/hreflang
Date: 2026-02-11
Summary: An HTML annotation that tells search engines which language and region each version of a page targets.

# HSTS (HTTP Strict Transport Security)
URL: https://www.sitecheck.dk/glossary/hsts
Term: HSTS
Date: 2026-03-02
Summary: A response header that forces browsers to use HTTPS for all future requests to a domain.

# HTTP Status Codes
URL: https://www.sitecheck.dk/glossary/http-status-codes
Date: 2026-04-25
Summary: Three-digit codes returned by a web server indicating whether an HTTP request succeeded, failed, or requires further action.

# HTTP/2
URL: https://www.sitecheck.dk/glossary/http2
Date: 2026-03-05
Summary: The second major version of HTTP, adding multiplexing, header compression, and binary framing for faster connections.

# HTTP/3
URL: https://www.sitecheck.dk/glossary/http3
Date: 2026-03-05
Summary: The third major version of HTTP, layered on the QUIC transport for lower latency and better resilience to packet loss.

# HTTPS
URL: https://www.sitecheck.dk/glossary/https
Date: 2026-03-05
Summary: The encrypted version of HTTP that uses TLS to protect data in transit between browser and server.

# INP (Interaction to Next Paint)
URL: https://www.sitecheck.dk/glossary/inp
Term: INP
Date: 2026-02-13
Summary: A Core Web Vitals metric that measures how quickly a page responds to user interactions.

# Keyword (SEO)
URL: https://www.sitecheck.dk/glossary/keywords
Term: Keyword
Date: 2026-02-11
Summary: A word or phrase users type into search engines to find content, used to target and structure pages for SEO.

# Lab Data
URL: https://www.sitecheck.dk/glossary/lab-data
Term: Lab data
Date: 2026-02-13
Summary: Performance measurements taken in a controlled environment with fixed device and network settings, used for repeatable testing.

# Lazy Loading
URL: https://www.sitecheck.dk/glossary/lazy-loading
Date: 2026-04-25
Summary: A technique that defers loading of non-critical resources like images, iframes, and scripts until they are needed.

# LCP (Largest Contentful Paint)
URL: https://www.sitecheck.dk/glossary/lcp
Term: LCP
Date: 2026-02-13
Summary: A Core Web Vital measuring the render time of the largest visible element in the viewport.

# Lighthouse
URL: https://www.sitecheck.dk/glossary/lighthouse
Date: 2026-02-13
Summary: Google's open-source auditing tool that scores pages on performance, accessibility, SEO, and best practices.

# llms.txt / ai.txt
URL: https://www.sitecheck.dk/glossary/llms-txt
Term: llms.txt
Date: 2026-02-11
Summary: Plain-text files at the site root that publish how large language models and AI crawlers may use the content they fetch.

# Meta Description
URL: https://www.sitecheck.dk/glossary/meta-description
Term: Meta description
Date: 2026-03-05
Summary: An HTML tag summarising a page's content, often shown as the snippet in search results.

# Mobile-First Indexing
URL: https://www.sitecheck.dk/glossary/mobile-first-indexing
Date: 2026-04-25
Summary: Google's practice of using the mobile version of a site as the primary source for indexing and ranking.

# noindex
URL: https://www.sitecheck.dk/glossary/noindex
Date: 2026-03-05
Summary: A directive that tells search engines to keep a page out of their index.

# Open Graph
URL: https://www.sitecheck.dk/glossary/open-graph
Date: 2026-03-05
Summary: Meta tags that control how a page appears when shared on social platforms.

# Permissions Policy
URL: https://www.sitecheck.dk/glossary/permissions-policy
Date: 2026-04-25
Summary: An HTTP response header that controls which browser features and APIs can run on a page and in its embedded frames.

# Redirect (301 / 302)
URL: https://www.sitecheck.dk/glossary/redirect
Term: Redirect
Date: 2026-03-05
Summary: How HTTP redirects work and when to use 301 (permanent) versus 302 (temporary).

# Referrer Policy
URL: https://www.sitecheck.dk/glossary/referrer-policy
Date: 2026-04-25
Summary: An HTTP header and HTML attribute that controls how much referrer URL information is sent on outgoing requests.

# robots.txt
URL: https://www.sitecheck.dk/glossary/robots-txt
Date: 2026-02-11
Summary: A plain-text file at the site root that tells crawlers which paths they may or may not request.

# RUM (Real User Monitoring)
URL: https://www.sitecheck.dk/glossary/rum
Term: RUM
Date: 2026-02-13
Summary: Performance data collected from real visitors in production, reflecting their actual devices, networks, and behaviour.

# sitemap.xml
URL: https://www.sitecheck.dk/glossary/sitemap-xml
Date: 2026-02-11
Summary: An XML file that lists important URLs on a site so search engines can discover and prioritize them.

# SPF (Sender Policy Framework)
URL: https://www.sitecheck.dk/glossary/spf
Term: SPF
Date: 2026-03-05
Summary: A DNS TXT record that lists the mail servers authorised to send email for a domain.

# SQL Injection
URL: https://www.sitecheck.dk/glossary/sql-injection
Date: 2026-03-05
Summary: A web vulnerability where untrusted input is concatenated into SQL queries, letting an attacker run arbitrary database commands.

# SSL/TLS
URL: https://www.sitecheck.dk/glossary/ssl-tls
Date: 2026-03-05
Summary: The cryptographic protocols that authenticate servers and encrypt traffic between clients and servers on the web.

# Structured Data (Schema.org)
URL: https://www.sitecheck.dk/glossary/structured-data
Term: Structured data
Date: 2026-02-11
Summary: Machine-readable markup, usually JSON-LD, that describes page content using the Schema.org vocabulary.

# TBT (Total Blocking Time)
URL: https://www.sitecheck.dk/glossary/tbt
Term: TBT
Date: 2026-02-13
Summary: A lab metric that sums how long the main thread was blocked by long tasks between FCP and Time to Interactive.

# TTFB (Time To First Byte)
URL: https://www.sitecheck.dk/glossary/ttfb
Term: TTFB
Date: 2026-02-13
Summary: The time between making a request and receiving the first byte of the response from the server.

# TTL (Time To Live)
URL: https://www.sitecheck.dk/glossary/ttl
Term: TTL
Date: 2026-03-02
Summary: A DNS record value telling resolvers how long they may cache that record before refetching it.

# Uptime Monitoring
URL: https://www.sitecheck.dk/glossary/uptime
Date: 2026-04-25
Summary: Automated checks that confirm a site is reachable and responding correctly, with alerts when it is not.

# URL
URL: https://www.sitecheck.dk/glossary/url
Date: 2026-01-23
Summary: A Uniform Resource Locator: the structured address used to fetch a resource on the web, made of scheme, host, path, and optional query and fragment.

# WCAG (Web Content Accessibility Guidelines)
URL: https://www.sitecheck.dk/glossary/wcag
Term: WCAG
Date: 2026-01-23
Summary: The W3C standard for making web content accessible, organised around the four POUR principles and three conformance levels.

# XSS (Cross‑Site Scripting)
URL: https://www.sitecheck.dk/glossary/xss
Term: XSS
Date: 2026-03-02
Summary: A vulnerability where attackers inject scripts that run in another user's browser session.