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d2l.ai

Dive into Deep Learning — Dive into Deep Learning 1.0.3 documentation

Last scanned Jul 26, 2026, 11:19 AM

72

Overall score

Fair

Summary

This website uses jQuery behind CloudFront CDN. SEO is fair (55/100) and accessibility is fair (70/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.

Top issues to fix

13 issues found · 4 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Missing meta description

    SEO

    Add a ~150-character meta description to control your search-result snippet and lift click-through rate.

  • Over half of images are missing alt text

    Accessibility

    Add alt attributes to images — screen readers depend on them, and they help image SEO.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

+7 more issues — details in the sections below.

55

SEO

7 issue(s) found

100

Performance

13 ms

65

Security

HTTPS & header checks

70

Accessibility

1 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

X (Twitter)GitHubGitHub

Meta tags

Title
Dive into Deep Learning — Dive into Deep Learning 1.0.3 documentation
Description
Canonical
Language
en
Charset
utf-8
Viewport
width=device-width, initial-scale=1, shrink-to-fit=no
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

jQuery

Hosting & CDN

Hosting provider
—
CDN provider
CloudFront
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Amazon
Subject
d2l.ai
Valid from
May 2, 2026
Valid to
Nov 15, 2026
Days until expiry
110
SAN domains
d2l.ai, *.d2l.ai

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: none · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 9 · H3 19

Links

204 internal · 34 external · 20 broken

Images

37 total · 34 missing alt

Scripts / Styles

11 scripts · 7 stylesheets

JS / CSS size

404 B · 2.6 KB

Page size

184 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Title longer than 60 characters
  • Missing meta description
  • Missing canonical link
  • No structured data (JSON-LD) found
  • Missing OpenGraph tags
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • Over half of images are missing alt text

Scan details

Requested URL
https://d2l.ai
Final URL
https://d2l.ai
HTTP status
200
HTTP version
HTTP/2
Response time
10 ms
HTML size
184 KB
Redirect chain
https://d2l.ai

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does d2l.ai use?
d2l.ai is built with jQuery.
Is d2l.ai secure (HTTPS)?
Yes. d2l.ai uses TLS 1.3 with a certificate issued by Amazon, valid until Nov 15, 2026.
Who hosts d2l.ai?
Hosting provider information for d2l.ai is not available yet.
What is d2l.ai's SEO score?
d2l.ai scored 55/100 for SEO in the latest analysis (fair).
What is d2l.ai's overall website score?
d2l.ai has an overall SiteGraph score of 72/100, combining SEO, performance, security, and accessibility.