vosviewer.com Website Information

Daily Unique Visits: 4,284

Daily Page Views: 17,136

Income Per Day: $48

Estimated Value: $25,920

This website is located in Netherlands and is using following IP address 132.229.26.33. See the complete list of popular websites hosted in Netherlands.

vosviewer.com is registered under .COM top-level domain. Please check other sites in .COM zone.

Website vosviewer.com is using the following name servers:

violet.leidenuniv.nl
indigo.leidenuniv.nl

and is probably hosted by SURFnet bv. See the full list of other websites hosted by SURFnet bv.

The highest website vosviewer.com position in Alexa rank database was 8032 and the lowest rank position was 999421. Current position of vosviewer.com in Alexa rank database is 292962.

Desktop speed score of vosviewer.com (40/100) is better than the results of 14.88% of other sites and shows that the page desktop performance can be improved.

Mobile usability score of vosviewer.com (100/100) is better than the results of 100% of other sites and means that the page is mobile-friendly.

Mobile speed score of vosviewer.com (27/100) is better than the results of 7.94% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

vosviewer.com Alexa Rank

The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and is a combined measure of page views and users.

vosviewer.com whois

WHOIS gives you the ability to lookup any generic domains to find out the registered domain holder. WHOIS database are provided for information purposes only. It allows the public to check whether a specific domain name is still available or not and to obtain information related to the registration records of existing domain names.

Domain Name: VOSVIEWER.COM
Registry Domain ID: 1561229408_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.rrpproxy.net
Registrar URL: http://www.key-systems.net
Updated Date: 2022-07-04T07:16:49Z
Creation Date: 2009-07-03T14:50:06Z
Registry Expiry Date: 2023-07-03T14:50:06Z
Registrar: Key-Systems GmbH
Registrar IANA ID: 269
Registrar Abuse Contact Email: abuse@key-systems.net
Registrar Abuse Contact Phone: +49.68949396850
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: EDNS5.ULTRADNS.COM
Name Server: EDNS5.ULTRADNS.ORG
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2022-09-06T16:02:28Z

vosviewer.com server information

Servers Location

vosviewer.com desktop page speed rank

Last tested: 2020-01-03

Desktop Speed Bad

40/100

vosviewer.com Desktop Speed Test Quick Summary

priority - 123Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 1.2MiB (55% reduction).

Compressing https://www.vosviewer.com/media/images/content/f8c…c1f2591ccd889__278.png could save 148.7KiB (78% reduction).
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Compressing https://www.vosviewer.com/media/images/content/330…d9a3a8554bece__278.png could save 136.7KiB (72% reduction).
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Compressing https://www.vosviewer.com/media/images/gallery/9fb…5d9346b5f41a8a6a9f.png could save 40.3KiB (21% reduction).
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Compressing https://www.vosviewer.com/media/images/style/ui/gallery_next.png could save 2.7KiB (90% reduction).
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Compressing https://www.vosviewer.com/media/images/style/ui/launchbutton.png could save 2.5KiB (76% reduction).
Compressing https://www.vosviewer.com/media/images/style/socials/socials.png could save 1.9KiB (12% reduction).
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Compressing https://www.vosviewer.com/media/images/style/ui/gallery_play.png could save 200B (33% reduction).

priority - 19Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

https://ws.sharethis.com/button/css/buttons-secure.css (expiration not specified)
https://www.vosviewer.com/media/images/content/08a…cedf5df544371__278.png (expiration not specified)
https://www.vosviewer.com/media/images/content/189…a4c4fea7db925__278.png (expiration not specified)
https://www.vosviewer.com/media/images/content/1c6…e75e4957918d3__200.png (expiration not specified)
https://www.vosviewer.com/media/images/content/330…d9a3a8554bece__278.png (expiration not specified)
https://www.vosviewer.com/media/images/content/7ae…d52b58621dc6f__200.jpg (expiration not specified)
https://www.vosviewer.com/media/images/content/a85…29d0ecff44b58__278.png (expiration not specified)
https://www.vosviewer.com/media/images/content/b61…74fb257b16e4e__278.png (expiration not specified)
https://www.vosviewer.com/media/images/content/ea3…65ac581592983__278.png (expiration not specified)
https://www.vosviewer.com/media/images/content/f8c…c1f2591ccd889__278.png (expiration not specified)
https://www.vosviewer.com/media/images/gallery/04f…a04ade04facfbb7ed2.png (expiration not specified)
https://www.vosviewer.com/media/images/gallery/823…7d4d9231def60f7a14.png (expiration not specified)
https://www.vosviewer.com/media/images/gallery/98a…7d2aa747262f2da2c8.png (expiration not specified)
https://www.vosviewer.com/media/images/gallery/9fb…5d9346b5f41a8a6a9f.png (expiration not specified)
https://www.vosviewer.com/media/images/gallery/e01…2e9ff5cee0f75a3700.png (expiration not specified)
https://www.vosviewer.com/media/images/style/logos/cwts_logo_background.png (expiration not specified)
https://www.vosviewer.com/media/images/style/logos…ogo_complete_white.png (expiration not specified)
https://www.vosviewer.com/media/images/style/logos/leidenuniv_logo.png (expiration not specified)
https://www.vosviewer.com/media/images/style/logos…ogo_complete_white.png (expiration not specified)
https://www.vosviewer.com/media/images/style/logos…er_logo_mini_white.png (expiration not specified)
https://www.vosviewer.com/media/images/style/menu/…_level1_background.png (expiration not specified)
https://www.vosviewer.com/media/images/style/menu/…_background_active.png (expiration not specified)
https://www.vosviewer.com/media/images/style/menu/…vel1_mp_background.png (expiration not specified)
https://www.vosviewer.com/media/images/style/menu/…enu_level1_pointer.png (expiration not specified)
https://www.vosviewer.com/media/images/style/menu/mainmenu_shader.png (expiration not specified)
https://www.vosviewer.com/media/images/style/menu/…vel1_mp_background.png (expiration not specified)
https://www.vosviewer.com/media/images/style/socials/socials.png (expiration not specified)
https://www.vosviewer.com/media/images/style/ui/gallery_next.png (expiration not specified)
https://www.vosviewer.com/media/images/style/ui/gallery_play.png (expiration not specified)
https://www.vosviewer.com/media/images/style/ui/gallery_prev.png (expiration not specified)
https://www.vosviewer.com/media/images/style/ui/gallery_sprite.png (expiration not specified)
https://www.vosviewer.com/media/images/style/ui/launchbutton.png (expiration not specified)
https://www.vosviewer.com/media/images/style/ui/preload.gif (expiration not specified)
https://www.vosviewer.com/media/images/style/ui/shadow_popup.png (expiration not specified)
https://buttons-config.sharethis.com/js/5def70c7ee37bc0019bf7408.js (60 seconds)
https://platform-api.sharethis.com/js/sharethis.js (10 minutes)
https://count-server.sharethis.com/v2.0/get_counts…2Fwww.vosviewer.com%2F (15 minutes)
https://ssl.google-analytics.com/ga.js (2 hours)

priority - 10Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 4 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

https://www.vosviewer.com/applepie_2_8/jquery/jque…1.min.js?v=2019022413a
https://www.vosviewer.com/applepie_2_8/jquery/jque…i.min.js?v=2019022413a
https://www.vosviewer.com/applepie_2_8/applepie.min.js?v=2019022413a
https://www.vosviewer.com/applepie_topping/topping.min.js?v=2019022413a

Optimize CSS Delivery of the following:

https://www.vosviewer.com/applepie_2_8/jquery/jque….min.css?v=2019022413a
https://www.vosviewer.com/style/core.min.css?v=2019022413a
https://www.vosviewer.com/applepie_2_8/shadowbox/s….min.css?v=2019022413a

priority - 7Avoid landing page redirects

Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.

Avoid landing page redirects for the following chain of redirected URLs.

http://vosviewer.com/
http://www.vosviewer.com/
https://www.vosviewer.com/

priority - 3Reduce server response time

In our test, your server responded in 0.52 seconds.

priority - 0Minify HTML

Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.

Minify HTML for the following resources to reduce their size by 2.9KiB (26% reduction).

Minifying https://www.vosviewer.com/ could save 2.6KiB (29% reduction) after compression.
Minifying https://ws.sharethis.com/secure/index.html could save 322B (16% reduction) after compression.

priority - 0Minify CSS

Compacting CSS code can save many bytes of data and speed up download and parse times.

Minify CSS for the following resources to reduce their size by 886B (12% reduction).

Minifying https://www.vosviewer.com/applepie_2_8/jquery/jque….min.css?v=2019022413a could save 886B (12% reduction) after compression.

priority - 0Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 231B (40% reduction).

Compressing https://count-server.sharethis.com/v2.0/get_counts…2Fwww.vosviewer.com%2F could save 231B (40% reduction).

vosviewer.com Desktop Resource Breakdown

Total Resources	63
Number of Hosts	9
Static Resources	49
JavaScript Resources	11
CSS Resources	5

vosviewer.com mobile page speed rank

Last tested: 2019-02-11

Mobile Speed Bad

27/100

vosviewer.com Mobile Speed Test Quick Summary

priority - 127Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 1.2MiB (55% reduction).

Compressing http://www.vosviewer.com/media/images/content/f8c9…c1f2591ccd889__278.png could save 148.7KiB (78% reduction).
Compressing http://www.vosviewer.com/media/images/content/b614…74fb257b16e4e__278.png could save 141.8KiB (75% reduction).
Compressing http://www.vosviewer.com/media/images/content/08a8…cedf5df544371__278.png could save 141.1KiB (74% reduction).
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Compressing http://www.vosviewer.com/media/images/content/3300…d9a3a8554bece__278.png could save 136.7KiB (72% reduction).
Compressing http://www.vosviewer.com/media/images/content/189f…a4c4fea7db925__278.png could save 133.3KiB (70% reduction).
Compressing http://www.vosviewer.com/media/images/content/a85a…29d0ecff44b58__278.png could save 122.9KiB (65% reduction).
Compressing http://www.vosviewer.com/media/images/content/1c61…e75e4957918d3__200.png could save 81.9KiB (79% reduction).
Compressing http://www.vosviewer.com/media/images/gallery/9fb2…5d9346b5f41a8a6a9f.png could save 40.3KiB (21% reduction).
Compressing http://www.vosviewer.com/media/images/content/f07c…8a9aefd52965a__100.png could save 36KiB (64% reduction).
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Compressing http://www.vosviewer.com/media/images/gallery/e019…2e9ff5cee0f75a3700.png could save 28KiB (17% reduction).
Compressing http://www.vosviewer.com/media/images/gallery/98a9…7d2aa747262f2da2c8.png could save 27.9KiB (19% reduction).
Compressing http://www.vosviewer.com/media/images/content/7ae5…d52b58621dc6f__200.jpg could save 19.3KiB (71% reduction).
Compressing http://www.vosviewer.com/media/images/style/ui/gallery_next.png could save 2.7KiB (90% reduction).
Compressing http://www.vosviewer.com/media/images/style/ui/gallery_prev.png could save 2.7KiB (91% reduction).
Compressing http://www.vosviewer.com/media/images/style/ui/launchbutton.png could save 2.5KiB (76% reduction).
Compressing http://www.vosviewer.com/media/images/style/socials/socials.png could save 1.9KiB (12% reduction).
Compressing http://www.vosviewer.com/media/images/style/logos/leidenuniv_logo.png could save 1,020B (11% reduction).
Compressing http://www.vosviewer.com/media/images/style/ui/gallery_play.png could save 200B (33% reduction).

priority - 61Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

Enable compression for the following resources to reduce their transfer size by 596.5KiB (72% reduction).

Compressing http://www.vosviewer.com/applepie_2_8/applepie.min.js?v=f6d8f8ee2f74 could save 339KiB (67% reduction).
Compressing http://www.vosviewer.com/style/core.min.css?v=f6d8f8ee2f74 could save 170.5KiB (86% reduction).
Compressing http://www.vosviewer.com/applepie_2_8/jquery/jquer….min.js?v=f6d8f8ee2f74 could save 61.1KiB (65% reduction).
Compressing http://www.vosviewer.com/ could save 23.8KiB (73% reduction).
Compressing http://www.vosviewer.com/applepie_2_8/shadowbox/sh…min.css?v=f6d8f8ee2f74 could save 1.4KiB (66% reduction).
Compressing http://www.vosviewer.com/style/gallery/custom.html could save 642B (59% reduction).
Compressing http://pd.sharethis.com/pd/test_oracle could save 125B (29% reduction).

priority - 40Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 4 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.

Remove render-blocking JavaScript:

http://www.vosviewer.com/applepie_2_8/jquery/jquer….min.js?v=f6d8f8ee2f74
http://www.vosviewer.com/applepie_2_8/jquery/jquer….min.js?v=f6d8f8ee2f74
http://www.vosviewer.com/applepie_2_8/applepie.min.js?v=f6d8f8ee2f74
http://www.vosviewer.com/applepie_topping/topping.min.js?v=f6d8f8ee2f74

Optimize CSS Delivery of the following:

http://www.vosviewer.com/applepie_2_8/jquery/jquer…min.css?v=f6d8f8ee2f74
http://www.vosviewer.com/style/core.min.css?v=f6d8f8ee2f74
http://www.vosviewer.com/applepie_2_8/shadowbox/sh…min.css?v=f6d8f8ee2f74

priority - 28Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

http://pd.sharethis.com/pd/test_oracle (expiration not specified)
http://www.vosviewer.com/media/images/content/08a8…cedf5df544371__278.png (expiration not specified)
http://www.vosviewer.com/media/images/content/189f…a4c4fea7db925__278.png (expiration not specified)
http://www.vosviewer.com/media/images/content/1c61…e75e4957918d3__200.png (expiration not specified)
http://www.vosviewer.com/media/images/content/3300…d9a3a8554bece__278.png (expiration not specified)
http://www.vosviewer.com/media/images/content/7ae5…d52b58621dc6f__200.jpg (expiration not specified)
http://www.vosviewer.com/media/images/content/a85a…29d0ecff44b58__278.png (expiration not specified)
http://www.vosviewer.com/media/images/content/b614…74fb257b16e4e__278.png (expiration not specified)
http://www.vosviewer.com/media/images/content/ea30…65ac581592983__278.png (expiration not specified)
http://www.vosviewer.com/media/images/content/f07c…8a9aefd52965a__100.png (expiration not specified)
http://www.vosviewer.com/media/images/content/f8c9…c1f2591ccd889__278.png (expiration not specified)
http://www.vosviewer.com/media/images/gallery/04f3…a04ade04facfbb7ed2.png (expiration not specified)
http://www.vosviewer.com/media/images/gallery/823b…7d4d9231def60f7a14.png (expiration not specified)
http://www.vosviewer.com/media/images/gallery/98a9…7d2aa747262f2da2c8.png (expiration not specified)
http://www.vosviewer.com/media/images/gallery/9fb2…5d9346b5f41a8a6a9f.png (expiration not specified)
http://www.vosviewer.com/media/images/gallery/e019…2e9ff5cee0f75a3700.png (expiration not specified)
http://www.vosviewer.com/media/images/style/logos/…ogo_complete_white.png (expiration not specified)
http://www.vosviewer.com/media/images/style/logos/leidenuniv_logo.png (expiration not specified)
http://www.vosviewer.com/media/images/style/logos/…ogo_complete_white.png (expiration not specified)
http://www.vosviewer.com/media/images/style/logos/…er_logo_mini_white.png (expiration not specified)
http://www.vosviewer.com/media/images/style/menu/m…_level1_background.png (expiration not specified)
http://www.vosviewer.com/media/images/style/menu/m…_background_active.png (expiration not specified)
http://www.vosviewer.com/media/images/style/menu/m…vel1_mp_background.png (expiration not specified)
http://www.vosviewer.com/media/images/style/menu/m…enu_level1_pointer.png (expiration not specified)
http://www.vosviewer.com/media/images/style/menu/mainmenu_shader.png (expiration not specified)
http://www.vosviewer.com/media/images/style/menu/s…vel1_mp_background.png (expiration not specified)
http://www.vosviewer.com/media/images/style/socials/socials.png (expiration not specified)
http://www.vosviewer.com/media/images/style/ui/gallery_next.png (expiration not specified)
http://www.vosviewer.com/media/images/style/ui/gallery_play.png (expiration not specified)
http://www.vosviewer.com/media/images/style/ui/gallery_prev.png (expiration not specified)
http://www.vosviewer.com/media/images/style/ui/gallery_sprite.png (expiration not specified)
http://www.vosviewer.com/media/images/style/ui/launchbutton.png (expiration not specified)
http://www.vosviewer.com/media/images/style/ui/preload.gif (expiration not specified)
http://www.vosviewer.com/media/images/style/ui/shadow_popup.png (expiration not specified)
https://ws.sharethis.com/button/css/buttons-secure.css (expiration not specified)
http://t.sharethis.com/1/d/t.dhj?rnd=1549886469060…&dmn=www.vosviewer.com (60 minutes)
http://www.google-analytics.com/ga.js (2 hours)

priority - 8Prioritize visible content

Your page requires additional network round trips to render the above-the-fold content. For best performance, reduce the amount of HTML needed to render above-the-fold content.

The entire HTML response was not sufficient to render the above-the-fold content. This usually indicates that additional resources, loaded after HTML parsing, were required to render above-the-fold content. Prioritize visible content that is needed for rendering above-the-fold by including it directly in the HTML response.

Only about 41% of the final above-the-fold content could be rendered with the full HTML response.

Click to see the screenshot with only the HTML response:

priority - 4Reduce server response time

In our test, your server responded in 0.48 seconds.

priority - 1Minify HTML

Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.

Minify HTML for the following resources to reduce their size by 10.2KiB (29% reduction).

Minifying http://www.vosviewer.com/ could save 9.8KiB (31% reduction).
Minifying https://ws.sharethis.com/secure/index.html could save 321B (16% reduction) after compression.
Minifying http://www.vosviewer.com/style/gallery/custom.html could save 129B (12% reduction).

priority - 0Minify JavaScript

Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.

Minify JavaScript for the following resources to reduce their size by 110B (26% reduction).

Minifying http://pd.sharethis.com/pd/test_oracle could save 110B (26% reduction).

vosviewer.com Mobile Resource Breakdown

Total Resources	84
Number of Hosts	19
Static Resources	52
JavaScript Resources	13
CSS Resources	5

vosviewer.com mobile page usability

Last tested: 2019-02-11

Mobile Usability Good

100/100

vosviewer.com HTML validation

Errors

Internal encoding declaration “iso-8859-1” disagrees with the actual encoding of the document (“utf-8”).

Line: 9 Column: 3 - 76
"...set --> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" /> <!-..." Line: 11 Column: 3 - 76
"...ent --> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" /> <me..."

Bad value “text/html; charset=iso-8859-1” for attribute “content” on element “meta”: “iso-8859-1” is not a preferred encoding name. The preferred label for this encoding is “windows-1252”.

A document must not include more than one “meta” element with a “http-equiv” attribute whose value is “content-type”.

Line: 11 Column: 3 - 76
"...ent --> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" /> <me..."

Bad value “X-Frame-Options” for attribute “http-equiv” on element “meta”.

Line: 12 Column: 3 - 54
"...9-1" /> <meta http-equiv="X-Frame-Options" content="deny" /> <me..."

Bad value “window-target” for attribute “http-equiv” on element “meta”.

Line: 13 Column: 3 - 50
"...eny" /> <meta http-equiv="window-target" content="_top"> ..."

Attribute “value” not allowed on element “meta” at this point.

Line: 15 Column: 133 - 191
".../> <meta itemprop="dateModified" value="2018-02-16 16:33:31"/> <met..."

Element “meta” is missing required attribute “content”.

Line: 15 Column: 133 - 191
".../> <meta itemprop="dateModified" value="2018-02-16 16:33:31"/> <met..."

Attribute “postal-code” not allowed on element “span” at this point.

Line: 186 Column: 7 - 99
"...an> <span itemprop="address" itemscope postal-code itemtype="http://data-vocabulary.org/Address"> ..."

Bad value “Information (left)” for attribute “name” on element “a”: An ID must not contain whitespace.

Line: 282 Column: 8 - 96
"..."> <a class="anchortarget" data-anchortarget="Information (left)" name="Information (left)"></a> ..."

Bad value “shadowbox[serie49E];” for attribute “rel” on element “a”: The string “shadowbox[serie49E];” is not a registered keyword.

Line: 365 Column: 2 - 125
"... <p> <a class="SBXimagelink" rel="shadowbox[serie49E];" href="/media/images/content/f8c91372ecf0176183cc1f2591ccd889_large.png"><img a..." Line: 365 Column: 282 - 405
"...;" /></a> <a class="SBXimagelink" rel="shadowbox[serie49E];" href="/media/images/content/b6143a8f7b981b12de374fb257b16e4e_large.png"><img a..." Line: 365 Column: 562 - 685
"...;" /></a> <a class="SBXimagelink" rel="shadowbox[serie49E];" href="/media/images/content/ea30284dd349a3651f465ac581592983_large.png"><img a..." Line: 365 Column: 842 - 965
"...;" /></a> <a class="SBXimagelink" rel="shadowbox[serie49E];" href="/media/images/content/189fa516c4e9066c941a4c4fea7db925_large.png"><img a..." Line: 365 Column: 1122 - 1245
"...;" /></a> <a class="SBXimagelink" rel="shadowbox[serie49E];" href="/media/images/content/3300d2761b6963f793ad9a3a8554bece_large.png"><img a..." Line: 365 Column: 1402 - 1525
"...;" /></a> <a class="SBXimagelink" rel="shadowbox[serie49E];" href="/media/images/content/a85a6c4ea4be8fe712929d0ecff44b58_large.png"><img a..." Line: 365 Column: 1681 - 1804
"...x;" /></a><a class="SBXimagelink" rel="shadowbox[serie49E];" href="/media/images/content/08a8dd14196910a1715cedf5df544371_large.png"><img a..."

Bad value “Information (right)” for attribute “name” on element “a”: An ID must not contain whitespace.

Line: 370 Column: 8 - 98
"..."> <a class="anchortarget" data-anchortarget="Information (right)" name="Information (right)"></a> ..."

Bad value “shadowbox;” for attribute “rel” on element “a”: The string “shadowbox;” is not a registered keyword.

Line: 380 Column: 2 - 115
"...enter;"> <a class="SBXimagelink" rel="shadowbox;" href="/media/images/content/7ae58722bbc56df2860d52b58621dc6f_large.jpg"><img a..." Line: 389 Column: 2 - 115
"...enter;"> <a class="SBXimagelink" rel="shadowbox;" href="/media/images/content/f07cd60cef49fb127068a9aefd52965a_large.png"><img a..." Line: 398 Column: 2 - 115
"...enter;"> <a class="SBXimagelink" rel="shadowbox;" href="/media/images/content/1c6159af0e742bb3230e75e4957918d3_large.png"><img a..."

Attribute “st_url” not allowed on element “div” at this point.

Line: 414 Column: 9 - 153
"... <div class="st_facebook_custom st-custom-button" data-network="facebook" data-url="http://www.vosviewer.com/" st_url="http://www.vosviewer.com/"> ..." Line: 420 Column: 9 - 151
"...> <div class="st_twitter_custom st-custom-button" data-network="twitter" data-url="http://www.vosviewer.com/" st_url="http://www.vosviewer.com/"> ..." Line: 426 Column: 9 - 153
"...> <div class="st_linkedin_custom st-custom-button" data-network="linkedin" data-url="http://www.vosviewer.com/" st_url="http://www.vosviewer.com/"> ..." Line: 432 Column: 9 - 155
"...> <div class="st_sharethis_custom st-custom-button" data-network="sharethis" data-url="http://www.vosviewer.com/" st_url="http://www.vosviewer.com/"> ..."

Attribute “alt” not allowed on element “a” at this point.

Line: 461 Column: 5 - 70
"...ogo"> <a href="http://leidenuniv.nl/" alt="Leiden Univ" target="_blank"> ..."

The “itemprop” attribute was specified, but the element is not a property of any item.

Line: 15 Column: 133 - 191
".../> <meta itemprop="dateModified" value="2018-02-16 16:33:31"/> <met..."

Warnings

Empty heading.

Line: 225 Column: 8 - 11
"..."> <h4></h4> ..." Line: 231 Column: 8 - 11
"..."> <h4></h4> ..." Line: 237 Column: 8 - 11
"..."> <h4></h4> ..." Line: 243 Column: 8 - 11
"..."> <h4></h4> ..." Line: 249 Column: 7 - 11
"...""> <h4></h4> ..."

The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.

Line: 282 Column: 8 - 96
"..."> <a class="anchortarget" data-anchortarget="Information (left)" name="Information (left)"></a> ..." Line: 362 Column: 8 - 82
"..."> <a class="anchortarget" data-anchortarget="Screenshots" name="Screenshots"></a> ..." Line: 370 Column: 8 - 98
"..."> <a class="anchortarget" data-anchortarget="Information (right)" name="Information (right)"></a> ..."

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vosviewer.com Ping

Ping is a computer network administration software utility used to test the reachability of a host on an Internet Protocol (IP) network. It measures the round-trip time for messages sent from the originating host to a destination computer that are echoed back to the source.

vosviewer.com TRACEROUTE

Traceroute is a computer network diagnostic tool for displaying the route (path) and measuring transit delays of packets across an Internet Protocol (IP) network. The history of the route is recorded as the round-trip times of the packets received from each successive host (remote node) in the route (path); the sum of the mean times in each hop is a measure of the total time spent to establish the connection. Traceroute proceeds unless all (three) sent packets are lost more than twice, then the connection is lost and the route cannot be evaluated.

VOSVIEWER.COM VOSviewer - Visualizing scientific landscapes

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vosviewer.com Desktop Speed Test Quick Summary

priority - 123Optimize images

Properly formatting and compressing images can save many bytes of data.

Optimize the following images to reduce their size by 1.2MiB (55% reduction).

priority - 19Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

priority - 10Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 4 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.

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priority - 7Avoid landing page redirects

Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.

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priority - 3Reduce server response time

In our test, your server responded in 0.52 seconds.

priority - 0Minify HTML

Compacting HTML code, including any inline JavaScript and CSS contained in it, can save many bytes of data and speed up download and parse times.

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priority - 0Minify CSS

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priority - 0Enable compression

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priority - 127Optimize images

Properly formatting and compressing images can save many bytes of data.

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priority - 61Enable compression

Compressing resources with gzip or deflate can reduce the number of bytes sent over the network.

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priority - 40Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 4 blocking script resources and 3 blocking CSS resources. This causes a delay in rendering your page.

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Optimize CSS Delivery of the following:

priority - 28Leverage browser caching

Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.

Leverage browser caching for the following cacheable resources:

priority - 8Prioritize visible content

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vosviewer.com HTML validation

Errors

Internal encoding declaration “iso-8859-1” disagrees with the actual encoding of the document (“utf-8”).

Bad value “text/html; charset=iso-8859-1” for attribute “content” on element “meta”: “iso-8859-1” is not a preferred encoding name. The preferred label for this encoding is “windows-1252”.

A document must not include more than one “meta” element with a “http-equiv” attribute whose value is “content-type”.

Bad value “X-Frame-Options” for attribute “http-equiv” on element “meta”.

Bad value “window-target” for attribute “http-equiv” on element “meta”.

Attribute “value” not allowed on element “meta” at this point.

Element “meta” is missing required attribute “content”.

Attribute “postal-code” not allowed on element “span” at this point.

Bad value “Information (left)” for attribute “name” on element “a”: An ID must not contain whitespace.

Bad value “shadowbox[serie49E];” for attribute “rel” on element “a”: The string “shadowbox[serie49E];” is not a registered keyword.

Bad value “Information (right)” for attribute “name” on element “a”: An ID must not contain whitespace.

Bad value “shadowbox;” for attribute “rel” on element “a”: The string “shadowbox;” is not a registered keyword.

Attribute “st_url” not allowed on element “div” at this point.

Attribute “alt” not allowed on element “a” at this point.

The “itemprop” attribute was specified, but the element is not a property of any item.

Warnings

Empty heading.