Tdg.docbook.org - SEO Checker

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Overview of the SEO Check
Meta information
70% 
Page quality
56% 
Page structure
70% 
Link structure
100% 
Server
100% 
External factors
60% 
SEO Score
Response time
0.19 s
File size
5.10 kB
Words
435
Media files
1
Number of links
21 internal / 3 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
DocBook: The Definitive Guide
The length of the page title is perfect. (275 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is missing.
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Server location: Germany
The language is not specified in the HTML markup.
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
No doctype markup was found.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
charsetutf-8

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Page quality

Content
(Critically important)
There are only 435 words on this page. Good pages should have about 800 words of useful content.
There are 4 text duplicates on this page:
  • Duplicate: There are different versions of the book that are evolving (slowly) an...
35.6% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
The page contains a listing, which indicates a good text layout.
10 paragraphs were found on this page.
No placeholders texts or images were found.
The average number of words per sentence of 12.33 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No viewpoint tag is provided.
No Apple touch icon is specified.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 9 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
https://docbook.org/graphics/banner.pngBanner graphic

Page structure

H1 heading
(Critically important)
tdg.DocBook.org Banner graphic
Too many H1 headings
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 tdg.DocBook.org Banner graphic
H1 DocBook 5: The Definitive Guide
H1 DocBook Publishers: The Definitive Guide
H1 Simplified DocBook: The Definitive Guide
H1 DocBook Slides: The Definitive Guide
H1 DocBook Website: The Definitive Guide
The number of internal links is ok.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 3 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://www.oreilly.com/catalo...External Subdomain DocBook: The Definitive Guide
https://www.oreilly.com/External Subdomain O’Reilly Media, Inc.
https://tdg.docbook.org/copyrightlegal notice
https://tdg.docbook.org/Anchor DocBook
https://tdg.docbook.org/Anchor DocBook Publishers
https://tdg.docbook.org/Anchor Simplified DocBook
https://tdg.docbook.org/Anchor Slides
https://tdg.docbook.org/Anchor Website
https://tdg.docbook.org/tdg/5.2/DocBook: TDG 5.2.19
https://tdg.docbook.org/tdg/5.1/DocBook: TDG 1.5.3
/tdg/5.0/docbookDocBook: TDG 5.0
https://www.oreilly.com/catalo...External Subdomain the published book
/tdg/4.5/docbookDocBook 4.5
/tdg/4.5/docbook-xDocBook: TDG 4.5
/tdg/3.1/docbookDocBook: TDG 3.1
/tdg/publishers/5.2/DocBook Publishers 1.3.13
/tdg/publishers/5.1/DocBook Publishers 1.2.1
/tdg/publishers/5.0/DocBook Publishers 1.0.2
/tdg/sdocbook/5.2/Simplified DocBook 0.9.10
/tdg/sdocbook/5.1/Simplified DocBook 0.9.1
/tdg/slides/5.2/DocBook Slides 0.9.10
/tdg/slides/5.1/DocBook Slides 0.9.1
/tdg/website/5.2/DocBook Website 0.9.10
/tdg/website/5.2/DocBook Website 0.9.1

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://tdg.docbook.org/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time is excellent with 0.19 seconds.
The file size of the HTML document is fine (5 kB).

HTTP Response Header

NameValue
accept-rangesbytes
age0
cache-controlpublic,max-age=0,must-revalidate
cache-status"Netlify Edge"; fwd=miss
content-encodingbr
content-typetext/html; charset=UTF-8
dateSun, 10 Aug 2025 19:59:28 GMT
etag"a3c57db0403671c8b5752c9e1a64f6e4-ssl-df"
serverNetlify
strict-transport-securitymax-age=31536000
varyAccept-Encoding
x-nf-request-id01K2AS23KTX6AP4E981BXSKBVN
statuscode200
http_versionHTTP/2

External factors

This page has only a few links from other websites.
This page only has backlinks from 20 referring domains.
This page only has 37 backlinks.
This page only has few backlinks from 16 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

No valid Robots.txt file was found.

Similar sites

Search preview

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
DocBook76%Check
org63%Check
tdg62%Check
DocBook Publishers55%Check
Simplified DocBook55%Check
DocBook Slides55%Check
DocBook Website55%Check
Documents DocBook53%Check
Standard DocBook53%Check
Definitive51%Check
Show more keywords and terms

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