Chem.libretexts.org - SEO Checker

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Overview of the SEO Check
Meta information
80% 
Page quality
94% 
Page structure
75% 
Link structure
33% 
Server
86% 
External factors
100% 
SEO Score
Response time
1.06 s
File size
104.30 kB
Words
509
Media files
6
Number of links
30 internal / 7 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Home - Chemistry LibreTexts
The length of the page title is perfect. (262 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.
The meta description is too long: 1046 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://chem.libretexts.org/
There is a valid canonical link specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
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)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1
generatorMindTouch
robotsindex,follow
descriptionThe LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.
article:published_time2013-10-02T00:32:07Z
article:modified_time2023-09-03T01:33:55Z
langen
twitter:cardsummary
twitter:titleHome
twitter:descriptionThe LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.
twitter:imagehttps://a.mtstatic.com/@public/production/site_4334/1641605566-social-share.png
og:titleHome
og:site_nameChemistry LibreTexts
og:typearticle
og:localeen_US
og:urlhttps://chem.libretexts.org
og:imagehttps://a.mtstatic.com/@public/production/site_4334/1641605566-social-share.png
og:descriptionThe LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.

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Page quality

Content
(Critically important)
This page contains 509 words. That's ok.
15.5% of the text are stop words.
The page contains a listing, which indicates a good text layout.
4 paragraphs were found on this page.
The text content is perfect.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 11.35 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
A viewport "width=device-width, initial-scale=1" is provided.
At least one 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 10 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
cdn.libretexts.net/Logos/chem_full.pngLibrary homepage
cdn.libretexts.net/Logos/chem_full.pngLibrary homepage
...production/site_4334/1474925093-logo.pngChemistry LibreTexts
...00/mindtouch.page%23thumbnail?revision=6mindtouch.page#thumbnail
...98/mindtouch.page%23thumbnail?revision=5mindtouch.page#thumbnail
...17/mindtouch.page%23thumbnail?revision=2mindtouch.page#thumbnail

Page structure

H1 heading
(Critically important)
There is no H1 heading specified.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.
Some headings do not have any content.

Heading structure

Heading levelContent
H2 Search
H2 Empty heading
H2 Error
H4 Text Color
H4 Text Size
H4 Margin Size
H4 Font Type
Some internal links have dynamic parameters. All internal URLs, which are not marked as nofollow, should not contain dynamic parameters.
Some anchor texts are used more than once.
The number of internal links is ok.
None of the anchor texts is too long.
There are 7 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://chem.libretexts.org/Anchor Skip to main content
A-TITLE Press enter to skip to the main content
https://chem.libretexts.org/Subdomain IMG-ALT Library homepage
/CoursesSubdomain school Campus Bookshelves
/BookshelvesSubdomain menu_book Bookshelves
/Ancillary_MaterialsSubdomain perm_media Learning Objects
/Special:Userlogin?readerViewSubdomain Anchor login Login
https://register.libretexts.org/New window Nofollow External Subdomain how_to_reg Request Instructor Account
https://commons.libretexts.org/New window Nofollow External Subdomain hub Instructor Commons
/?downloadsSubdomain Downloads expand_more
/?downloadpageSubdomain Download Page (PDF)
/?downloadfullSubdomain Download Full Book (PDF)
/?resourcesSubdomain Resources expand_more
/?pertableSubdomain Periodic Table
/?physconstSubdomain Physics Constants
/?scientificcalSubdomain Scientific Calculator
/?referencesSubdomain Reference expand_more
/?refmodalSubdomain Reference & Cite
/?toolsSubdomain Tools expand_more
https://chem.libretexts.org/?helpSubdomain Help expand_more
/?helpmodalSubdomain Get Help
/?feedbackSubdomain Feedback
/?readabilitySubdomain Readability
https://chem.libretexts.org/Subdomain Text duplicate IMG-ALT Library homepage
/Special:UserLogin?returntotitleSubdomain Sign in
A-TITLE Sign in
https://chem.libretexts.org/Subdomain IMG-ALT Chemistry LibreTexts
A-TITLE Chemistry LibreTexts
/Special:UserLogin?returntotitleSubdomain Text duplicate Sign in
A-TITLE Sign in
/Special:UserPasswordSubdomain Forgot password
A-TITLE Retrieve lost password
https://chem.libretexts.org/Subdomain No Text
https://libretexts.org/New window Nofollow External LibreTexts project
/CoursesSubdomain Campus Bookshelves
IMG-ALT mindtouch.page#thumbnail
A-TITLE Campus Bookshelves: The Course Shells area holds campus- and faculty-specific course areas. Each course shell is uniquely designed to address the needs of fa...
/BookshelvesSubdomain Bookshelves
IMG-ALT mindtouch.page#thumbnail
A-TITLE Bookshelves: The Bookshelves area in this LibreTexts Library holds texts that are curated by the LibreTexts Development team and can be used either directly ...
/Ancillary_MaterialsSubdomain Learning Objects
IMG-ALT mindtouch.page#thumbnail
A-TITLE Learning Objects
https://chem.libretexts.org/New window Subdomain Home
https://mindtouch.com/demoNew window External Powered by CXone Expert ®
A-TITLE MindTouch
https://www.nice.com/resources...New window Nofollow External Subdomain Powered by NICE CXone Expert
https://libretexts.org/legal/i...New window Nofollow External Legal
https://commons.libretexts.org...New window Nofollow External Subdomain Accessibility Statement

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://chem.libretexts.org/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
This page uses GZip for compressed data transmission.
Performance
(Somewhat important)
The page response time is slow (1.06 seconds). The response time should be less than 0.4 seconds. Slow websites are bad for search engine bots and also result in bad user experience.
The file size of the HTML document is fine (104 kB).

HTTP Response Header

NameValue
content-typetext/html; charset=utf-8
content-length25368
dateSun, 26 May 2024 05:13:23 GMT
content-languageen-US
x-xss-protection1; mode=block
content-security-policyupgrade-insecure-requests; default-src https: data: filesystem: blob: mediastream: 'unsafe-inline' 'unsafe-eval'; connect-src https: wss:
expires-1
cache-controlno-cache, no-store, must-revalidate, max-age=0
varyAccept-Encoding,Cookie
x-content-type-optionsnosniff
x-deki-siteid=site_4334
set-cookie86 Characters
strict-transport-securitymax-age=31536000; includeSubDomains
content-encodinggzip
x-cacheMiss from cloudfront
via1.1 f1b6636265d2ca44d8a0ca5488a5ec0c.cloudfront.net (CloudFront)
x-amz-cf-popFRA60-P10
alt-svch3=":443"; ma=86400
x-amz-cf-idcM1Br_TphPfhh6hI2yRb9knx__7m1IUz1TdYPgQ0gJa2F1a-00xhyA==
statuscode200
http_versionHTTP/2

External factors

Blacklists
(Nice to have)
This website is not classified "for adult only".
This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 12,137 referring domains.
This page has 271,121 backlinks.
This page has backlinks from 6,714 different ip addresses.
Facebook popularity
(Somewhat important)
The page has 1085 shares and comments on Facebook.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-Agent: *
Crawl-delay: 5
Sitemap: https://chem.libretexts.org/sitemap.xml
Request-rate: 1/5

# allow file attachments
Allow: /@api/deki/files/

# allow GSA authentication
Allow: /@api/deki/users/authenticate
Allow: /Special:UserLogin
Allow: /*title=Special:UserLogin
Allow: /@app/auth/
Allow: /@app/saml/

# block operational (non content) locations
Disallow: /Special:*
Disallow: /*title=Special:*
Disallow: /Template:*
Disallow: /*title=Template:*
Disallow: /User:*
Disallow: /*title=User:*
Disallow: /deki/
Disallow: /*action=*
Disallow: /@*

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chem.libretexts.org
Home - Chemistry LibreTexts
The LibreTexts libraries collectively are a multi-institutional collaborative venture to develop the next generation of open-access texts to improve postsecondary education.

Most important keywords

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

KeywordResultRecheck
Text81%Check
libretexts73%Check
Chemistry LibreTexts60%Check
open-access texts59%Check
LibreTexts libraries59%Check
Chemistry48%Check
org48%Check
collaborative46%Check
education46%Check
multi-institutional46%Check
Show more keywords and terms

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