las.ac.cn

https://las.ac.cn· First analyzed 05 May 2026· Updated 05 May 2026

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las.ac.cn

Mobile

Sponsored

Hosting Provider

CSTNET

IP Address

124.16.154.125

Site Location

🇨🇳 Chinavia tld

Server Location

🇨🇳 Chaowai, China

ASN

AS7497

Organization

CSTNET

Server

Nginx

Nameservers

ns4.cstnet.cn.ns3.cstnet.cn.

Performance

Core Web Vitals

Weight

First Contentful Paint

2.4 s10%

Speed Index

3.2 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

3 MB

80 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

CSTNET

Technology Stack

7 Technologies Detected

CSS Frameworks

Libraries

Other

UI Components

Icon Libraries

Web Servers

SEO Analysis

F39/100

Meta Tags4/15

Content9/12

Headings1/8

Technical10/21

E-E-A-T0/7

Images1/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile1/4

Indexability3/3

las.ac.cnlas.ac.cn

中国科学院知识服务平台

No description available for this page.

Title Length11 chars

Recommended: 50-60 chars (~68px / 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 (60/62) — critical for accessibility and SEO

13 issues found

Upgrade to view details

Local SEO

Local Search Readiness

3/100

Poor

1 14 2

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

Sponsored

AI & LLM Readiness

F28/100

Bot Access

20/25

Machine Read.

3/25

Schema Data

0/25

Citation

5/25

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

def. listsnavheader/footer

Text ratio:2%

Words:271

Token eff.:Too Short

Sections/1K:14.8

Depth:3/5

Structured Data

No Schema

Citation Readiness

Opening Summary

Descriptive Headingsavg 1w

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.

49/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

5/15

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

7/15

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.

5 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.

7/100

377 mg

CO₂e / view

3.0 MB

Page Weight

30%

Cleaner Than

New Visitor

431 mg

Returning (cached)

215 mg

Annual (10K/mo)

45.2 kg

Emission Segments

Data Center

84 mg

Network

91 mg

Device

202 mg

Resource Breakdown

JavaScript

299.5 KB

Images

2.1 MB

CSS

471.1 KB

HTML

92.7 KB

Other

4.9 KB

Green Hosting Not Verified

CSTNET

7 recommendations

•Carbon footprint recommendation preview...

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Security Score

41%Poor

Interactive

HTTPS

No WAF

155d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

China Financial Certification Authority

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

Valid From

23.03.2026

Valid Until

08.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.las.ac.cnlas.ac.cn

SHA-256 Fingerprint

90:48:14:1D:96:DC:A1:AE:E9:CF:99:AF:6A:BD:62:A7:25:BF:3D:17...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

connection

keep-alive

content-language

zh-CN

content-type

text/html;charset=UTF-8

date

Tue, 05 May 2026 20:25:24 GMT

server

nginx

transfer-encoding

chunked

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

mail.las.ac.cn

Domain Information

las.ac.cn

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.

63/100

Mobile Friendly3 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, initial-scale=1, shrink-to-fit=no

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Microsoft Yahei

WCAG Partial

53/100

Readability

/30

18/30

14px · LH 1.71

Hierarchy

/20

8/20

WCAG

/25

14/25

1:1 min contrast

Performance

/25

13/25

1 font · 2 req

Heading Font

Microsoft Yahei

Sans

Body Font

Microsoft Yahei

Sans14px

Contrast Ratio

1:1

7 issues

Reading Comfort

~39 CPL

Narrow lines

18px

14px

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

⚠️ Partial contrast: 7 elements below WCAG AA threshold (min 1.0:1).

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFonts

Color Palette

10 unique colors

Light

#ffffff

Background· 26.599999999999998%

#bbdff3

Primary· 21.4%

#0c9bd4

Primary· 17.5%

#6db0ca

Secondary· 8.8%

#e3f2f5

Secondary· 6.2%

#339dcd

Accent· 5.1%

#9cc3d9

Secondary· 4.5%

#4671a6

Secondary· 2.9%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(10)hm.baidu.com(1)

Website Identity

las.ac.cn

Location detected: 🇨🇳 Chinavia tld

en-US

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Last analyzed: 05 May 2026 at 20:52

Historical Analysis & Change Tracking