cdsonla.edu.vn

https://cdsonla.edu.vn· First analyzed 14 May 2026· Updated 14 May 2026

Export

cdsonla.edu.vn

Mobile

Sponsored

Hosting Provider

Vietnam Posts and Telecommunications Group

IP Address

14.178.142.30

Site Location

🇻🇳 Vietnamvia tld

Server Location

🇻🇳 Hanoi, Vietnam

ASN

AS45899

Organization

Vietnam Posts and Telecommunications Group

Server

Nginx

Nameservers

ns2.pavietnam.vn.nsbak.pavietnam.net.ns1.pavietnam.vn.

Performance

Core Web Vitals

Weight

First Contentful Paint

1.7 s10%

Speed Index

2.2 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

11 MB

166 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Technology Stack

5 Technologies Detected

CSS Frameworks

Libraries

UI Components

Web Servers

SEO Analysis

C60/100

Meta Tags10/15

Content11/12

Headings3/8

Technical17/25

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

cdsonla.edu.vncdsonla.edu.vn

Trang chủ | Cổng thông tin điện tử - Trường Cao đẳng Sơn La

No description available for this page.

Title Length59 chars

Recommended: 50-60 chars (~359px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1
• Most images missing alt text (43/43) — critical for accessibility and SEO

9 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

53 rules

Local SEO

Local Search Readiness

14/100

Poor

4 12 2

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

Sponsored

AI & LLM Readiness

D43/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

0/25

Citation

13/25

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

navheader/footer

Text ratio:9%

Words:1,659

Token eff.:Optimal

Sections/1K:9

Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary141w

Descriptive Headingsavg 9.5w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

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.

64/100

Passed

Critical

Warnings

Images & Alt Text

10/20

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

Semantic Structure

13/20

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

7/15

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

4 recommendations

•Accessibility recommendation preview...

Upgrade to view recommendations

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.

34/100

1.40 g

CO₂e / view

11.0 MB

Page Weight

Cleaner Than

New Visitor

1.60 g

Returning (cached)

799 mg

Annual (10K/mo)

167.8 kg

Emission Segments

Data Center

312 mg

Network

336 mg

Device

751 mg

Resource Breakdown

JavaScript

143.8 KB

Images

6.5 MB

CSS

4.4 MB

HTML

16.4 KB

Other

960 B

Green Hosting Not Verified

Vietnam Posts and Telecommunications Group

5 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

41%Poor

Interactive

HTTPS

No WAF

51d

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/2

Valid From

06.04.2026

Valid Until

05.07.2026

Subject Alternative Names (2)

cdsonla.edu.vnwww.cdsonla.edu.vn

SHA-256 Fingerprint

19:40:28:99:2F:6D:01:B0:3C:C7:43:96:70:7E:74:DA:7E:35:F7:DA...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔵 1 Days(max-age=86400, public)

content-encoding

📦 Gzip(gzip)

content-language

content-type

text/html; charset=UTF-8

date

Thu, 14 May 2026 09:50:02 GMT

etag

W/"1778752201"

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

MX Records (7)

ASPMX.L.GOOGLE.COM

ASPMX5.GOOGLEMAIL.COM

ASPMX2.GOOGLEMAIL.COM

ALT1.ASPMX.L.GOOGLE.COM

+3 more

Domain Information

cdsonla.edu.vn

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.

61/100

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, shrink-to-fit=no

2 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Roboto

WCAG Partial

61/100

Readability

/30

24/30

16px · LH 1.50

Hierarchy

/20

6/20

WCAG

/25

13/25

1:1 min contrast

Performance

/25

18/25

System fonts

Heading Font

Roboto

Sans

Body Font

Roboto

Sans16px

Contrast Ratio

1:1

13 issues

Reading Comfort

~48 CPL

Optimal (45–75)

18px

28px

16px

Minor Second

Scale

✅ Excellent readability: 16px body text is ideal for all devices.

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

✅ Optimal line length: ~48 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 1.0:1).

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

⚠️ Text justify detected: Justified text creates uneven word spacing, hurting readability on web.

Color Palette

9 unique colors

Light

#ffffff

Background· 20.900000000000002%

#101f3d

Accent· 27.1%

#17325c

Accent· 14%

#224572

Accent· 13.2%

#8d0305

Primary· 11.2%

#5b4680

Secondary· 5.4%

#261a52

Accent· 4.1%

#94aeb6

Secondary· 3.5%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(20)

Website Identity

cdsonla.edu.vn

cdsonla@cdsonla.edu.vn

Location detected: 🇻🇳 Vietnamvia tld

📧 Google Workspacevi

Sponsored

Last analyzed: 14 May 2026 at 19:03

Historical Analysis & Change Tracking