backbonejs.org

https://backbonejs.org· First analyzed 28 Apr 2026· Updated 28 Apr 2026

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backbonejs.org

Mobile

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Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.21.62.9

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

robin.ns.cloudflare.com.logan.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

594 ms10%

Speed Index

772 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

222 KB

16 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Platform

GitHub Pages

CDN

Cloudflare

Technology Stack

6 Technologies Detected

Libraries

Payments

Comments

CDN

SEO Analysis

D48/100

Meta Tags4/15

Content12/12

Headings3/8

Technical11/21

E-E-A-T0/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile1/4

Indexability3/3

backbonejs.orgbackbonejs.org

Backbone.js

No description available for this page.

Title Length11 chars

Recommended: 50-60 chars (~66px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1

13 issues found

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Local SEO

Local Search Readiness

0/100

Poor

15 2

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

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AI & LLM Readiness

F31/100

Bot Access

20/25

Machine Read.

4/25

Schema Data

0/25

Citation

7/25

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 blocks

Text ratio:59%

Words:19,827

Token eff.:Excessive

Sections/1K:0.6

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary41w

Descriptive Headingsavg 1.4w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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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.

59/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

4/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

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

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

4 recommendations

•Accessibility recommendation preview...

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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.

73/100

A+

22 mg

CO₂e / view

222.1 KB

Page Weight

95%

Cleaner Than

New Visitor

26 mg

Returning (cached)

13 mg

Annual (10K/mo)

2.7 kg

Emission Segments

Data Center

1 mg

Network

7 mg

Device

15 mg

Resource Breakdown

JavaScript

125.4 KB

Images

33.3 KB

CSS

2.2 KB

HTML

61.1 KB

Green Hosting Verified

Cloudflare

GWF Verified

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

0%Critical

Critical / Transactional

HTTPS

WAF

38d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

07.03.2026

Valid Until

05.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

backbonejs.org*.backbonejs.org

SHA-256 Fingerprint

F2:47:79:9C:D5:D6:F2:90:09:21:7D:7C:62:0E:6F:91:0A:C3:E1:A9...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin

age

301

alt-svc

h3=":443"; ma=86400

cache-control

🟡 600s(max-age=600)

cf-cache-status

DYNAMIC

cf-ray

9f3285c4acbb67b2-SJC

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (5)

eforward1.registrar-servers.com

eforward2.registrar-servers.com

eforward4.registrar-servers.com

eforward5.registrar-servers.com

+1 more

Domain Information

backbonejs.org

Domain Age

15 years

Created

28.04.2011

Expires

28.04.2027

Last Updated

03.04.2026

Registrar

Cloudflare, Inc.

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.

54/100

Mobile Friendly2 breakpoints

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

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Helvetica Neue

WCAG AA

67/100

Readability

/30

21/30

14px · LH 1.57

Hierarchy

/20

7/20

WCAG

/25

19/25

5.94:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Helvetica Neue

Sans

Body Font

Helvetica Neue

Sans14px

Contrast Ratio

5.94:1

WCAG AA (≥4.5:1)

Reading Comfort

~43 CPL

Narrow lines

22px

14px

⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.57 ratio (ideal range 1.4–1.6).

⚠️ Hard to read: Flesch score 50/100. Simplify sentences for wider reach.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 5.9:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ System fonts: Zero font loading delay — best possible LCP impact.

Flesch 50

Color Palette

3 unique colors

Light

#f9f9f9

Background· 85.59999999999997%

#788598

Primary· 8.3%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

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Scripts & Styles

7 Resources

Scripts

Styles

Async

Defer

Top Script Sources

test(3)docs(2)backbone.js(1)static.cloudflareinsights.com(1)

Website Identity

backbonejs.org

15 years old

Location detected: 🇨🇦 Canadavia ip

Cloudflare, Inc.

Social Profiles

X (Twitter)GitHub

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Last analyzed: 28 Apr 2026 at 02:09

Historical Analysis & Change Tracking