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htmhell.dev

https://htmhell.dev· First analyzed 13 May 2026· Updated 13 May 2026
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htmhell.dev
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Mobile screenshot of htmhell.dev
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Hosting Provider

H3A Housing

IP Address

86.59.113.118

Site Location

🇦🇹 Austriavia ip

Server Location

🇦🇹 Vienna, Austria

ASN

AS8437

Organization

H3A Housing

Server

Nginx

Nameservers

ns1.holub.co.at.ns2.holub.co.at.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
493 ms10%
Speed Index
641 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
32 KB
8 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
H3A Housing

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

2 Technologies Detected

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginx

SEO Analysis

C60/100
19
6
0
Meta Tags5/15
Content10/12
Headings8/8
Technical13/25
E-E-A-T0/7
Images0/7
Links5/5
URL5/5
Social5/5
Freshness2/4
Mobile4/4
Indexability3/3
H
htmhell.devhtmhell.dev

Markup from hell - HTMHell

A collection of bad practices in HTML, copied from real websites.

Title Length26 chars

Recommended: 50-60 chars (~160px / 580px)

Description Length65 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap
    robots.txt

    2 rules

    Allows all crawlers

    Local SEO

    Local Search Readiness

    4/100
    Poor
    1 15 2

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    D49/100
    Bot Access
    20/25
    Machine Read.
    14/25
    Schema Data
    0/25
    Citation
    15/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    code blocksnavheader/footer
    Text ratio:3%
    Words:569
    Token eff.:Optimal
    Sections/1K:8.8
    Depth:3/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary13w
    Descriptive Headingsavg 5.6w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (6)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    A
    87/100
    13
    Passed
    0
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    20/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    15/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    15/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    13/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    4/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    63/100
    A+
    4 mg
    CO₂e / view
    31.9 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    5 mg
    vs
    Returning (cached)
    2 mg
    Annual (10K/mo)
    468 g
    Emission Segments
    Data Center
    <0.001 g
    Network
    <0.001 g
    Device
    2 mg
    Resource Breakdown
    JavaScript
    5.1 KB
    Images
    5.5 KB
    CSS
    8.0 KB
    HTML
    2.7 KB
    Other
    10.6 KB
    Green Hosting Not Verified
    H3A Housing
    3 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    71%Good
    Static / Informational

    HTTPS

    No WAF

    44d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-384

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/1.1+H3

    Valid From

    29.03.2026

    Valid Until

    27.06.2026

    Subject Alternative Names (2)

    *.htmhell.devhtmhell.dev

    SHA-256 Fingerprint

    26:9B:BE:97:D5:CD:DD:7B:50:BB:93:0F:A0:41:08:35:C0:EB:FD:58...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    alt-svc
    h3=":443"; ma=86400
    connection
    keep-alive
    content-encoding
    ⚡ Brotli(br)
    content-type
    text/html
    date
    Wed, 13 May 2026 20:02:51 GMT
    etag
    W/"690de43e-53fe"
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    98

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (1)

    mail.htmhell.dev

    Domain Information

    htmhell.dev

    DNSSEC
    Not Enabled

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    C
    62/100
    Mobile Friendly1 breakpoint
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=device-width,initial-scale=1
    2 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    sans-serif

    WCAG Partial
    72/100
    Readability
    /30
    26/30

    20px · LH 1.50

    Hierarchy
    /20
    14/20

    1.75x ratio · ✓ H1→H6

    WCAG
    /25
    16/25

    1:1 min contrast

    Performance
    /25
    16/25

    0 fonts

    Heading Font

    sans-serif

    Sans35px

    Body Font

    sans-serif

    Sans20px

    Contrast Ratio

    1:1

    2 issues

    Reading Comfort

    Single Font Family

    left aligned
    35px
    h1
    26px
    h2
    20px
    p

    ✅ Excellent readability: 20px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

    ⚠️ Hard to read: Flesch score 32/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 1.0:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Lean font stack: 0 font families keeps load times fast.

    Flesch 32

    Color Palette

    8 unique colors
    9.27:1 AAA Light
    #ffffff
    Primary· 93.5%
    #474749
    Other· 0.9%
    #b5a3a2
    Secondary· 1.1%
    #946b6a
    Secondary· 1%
    #331213
    Secondary· 0.9%
    #e4d8d7
    Secondary· 0.9%

    Sponsored

    Scripts & Styles

    5 Resources

    2
    Scripts
    3
    Styles
    0
    Async
    0
    Defer

    Top Script Sources

    local(2)

    Website Identity

    htmhell.dev

    Location detected: 🇦🇹 Austriavia ip
    en

    Social Profiles

    GitHub

    Sponsored

    Last analyzed: 13 May 2026 at 20:03

    Historical Analysis & Change Tracking