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Domain name: lorentzcenter.nl
Status: active

Registrar:
Universiteit Leiden
Niels Bohrweg 1
2333CA Leiden
Netherlands

Abuse Contact:
abuse@leidenuniv.nl

Creation Date: 2005-03-22

Updated Date: 2021-05-11

DNSSEC: no

Domain nameservers:
edns5.ultradns.com
edns5.ultradns.org

Record maintained by: NL Domain Registry

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lorentzcenter.nl desktop page speed rank

Last tested: 2019-08-24


Desktop Speed Bad
43/100

lorentzcenter.nl Desktop Speed Test Quick Summary


priority - 138Optimize images

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priority - 4Leverage browser caching

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priority - 2Eliminate render-blocking JavaScript and CSS in above-the-fold content

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priority - 0Minify CSS

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lorentzcenter.nl Desktop Resource Breakdown

Total Resources12
Number of Hosts3
Static Resources9
JavaScript Resources1
CSS Resources1

lorentzcenter.nl mobile page speed rank

Last tested: 2019-12-06


Mobile Speed Medium
68/100

lorentzcenter.nl Mobile Speed Test Quick Summary


priority - 30Optimize images

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priority - 8Eliminate render-blocking JavaScript and CSS in above-the-fold content

Your page has 1 blocking CSS resources. This causes a delay in rendering your page.

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priority - 7Leverage 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://lorentzcenter.nl/images/facebook.jpg (expiration not specified)
https://lorentzcenter.nl/images/header_logo.jpg (expiration not specified)
https://lorentzcenter.nl/images/linkedin.jpg (expiration not specified)
https://lorentzcenter.nl/images/logos/LeidenUniv%20International2.png (expiration not specified)
https://lorentzcenter.nl/images/logos/NWOlogo.jpg (expiration not specified)
https://lorentzcenter.nl/images/twitter.jpg (expiration not specified)
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priority - 2Enable compression

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priority - 0Minify HTML

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priority - 0Minify CSS

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lorentzcenter.nl Mobile Resource Breakdown

Total Resources12
Number of Hosts3
Static Resources9
JavaScript Resources1
CSS Resources1

lorentzcenter.nl mobile page usability

Last tested: 2019-12-06


Mobile Usability Bad
59/100

lorentzcenter.nl Mobile Usability Test Quick Summary


priority - 40Use legible font sizes

The following text on your page renders in a way that may be difficult for some of your visitors to read. Use legible font sizes to provide a better user experience.

The following text fragments have a small font size. Increase the font size to make them more legible.

Center for Sci…ll Disciplines renders only 5 pixels tall (13 CSS pixels).

Search renders only 5 pixels tall (13 CSS pixels).

Present and Upcoming Events and 8 others render only 5 pixels tall (13 CSS pixels).

• Workshop: Me…nical Practice and 43 others render only 5 pixels tall (13 CSS pixels).

Deadline 30 January and 4 others render only 5 pixels tall (13 CSS pixels).

priority - 24Size tap targets appropriately

Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.

The following tap targets are close to other nearby tap targets and may need additional spacing around them.

The tap target <a href="lc/web/2019/11…venue=Snellius" class="front">• Workshop: Me…nical Practice</a> and 49 others are close to other tap targets.

priority - 10Configure the viewport

Your page does not have a viewport specified. This causes mobile devices to render your page as it would appear on a desktop browser, scaling it down to fit on a mobile screen. Configure a viewport to allow your page to render properly on all devices.

lorentzcenter.nl HTML validation

Errors

Start tag seen without seeing a doctype first. Expected “<!DOCTYPE html>”.

Line: 1 Column: 1 - 6
"...<html> <head..."

Stray doctype.

Line: 5 Column: 1 - 63
"...r</title> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html..."

Stray start tag “html”.

Line: 6 Column: 1 - 6
"...nal//EN"> <html> <HEAD..."

Start tag “head” seen but an element of the same type was already open.

Line: 7 Column: 1 - 6
"..."> <html> <HEAD> <meta..."

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

Line: 8 Column: 1 - 73
"...l> <HEAD> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" > <link..."

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”.

Line: 8 Column: 1 - 73
"...l> <HEAD> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" > <link..."

A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.

Line: 8 Column: 1 - 73
"...l> <HEAD> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" > <link..."

The “font” element is obsolete. Use CSS instead.

Line: 22 Column: 1 - 32
"...d=header> <font style="font-size: 25pt " >Lorent..." Line: 23 Column: 1 - 32
"...font><br> <font style="font-size: 10pt " >Intern..." Line: 27 Column: 34 - 55
"...arch.php"><font color="#FFFF00">Search..." Line: 34 Column: 4 - 25
"...pg')"> <b><font color="#FFFF00">Presen..." Line: 46 Column: 100 - 20
"...jpg')"><b><font color="#FFFFEA">Progra..." Line: 59 Column: 104 - 20
"...jpg')"><b><font color="#FFFFEA">Scient..." Line: 71 Column: 100 - 20
"...jpg')"><b><font color="#FFFFEA">Next A..." Line: 81 Column: 8 - 29
"..."> <b><font color="#FFFFEA">Subscr..." Line: 186 Column: 100 - 20
"...jpg')"><b><font color="#FFFFEA">About ..." Line: 202 Column: 104 - 20
"...jpg')"><b><font color="#FFFFEA">Visito..." Line: 221 Column: 116 - 16
"...jpg')"><b><font color="#FFFFEA">Leiden..." Line: 236 Column: 10 - 31
"... <b><font color="#FFFFEA"> NEWS ..."

The “width” attribute on the “table” element is obsolete. Use CSS instead.

Line: 25 Column: 1 - 57
"...r> </div> <table border=0 width="100%" CELLPADDING=0 CELLSPACING=0> <tr v..."

The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.

Line: 25 Column: 1 - 57
"...r> </div> <table border=0 width="100%" CELLPADDING=0 CELLSPACING=0> <tr v..." Line: 26 Column: 73 - 236
"...ign=right><table cellspacing=0 cellpadding=0 border=1 style="border: 1px; border-spacing: 0px; border-collapse: collapse; border-color: #003366; border-style: solid solid;" ><tr><t..."

The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.

Line: 25 Column: 1 - 57
"...r> </div> <table border=0 width="100%" CELLPADDING=0 CELLSPACING=0> <tr v..." Line: 26 Column: 73 - 236
"...ign=right><table cellspacing=0 cellpadding=0 border=1 style="border: 1px; border-spacing: 0px; border-collapse: collapse; border-color: #003366; border-style: solid solid;" ><tr><t..."

The “border” attribute on the “table” element is obsolete. Use CSS instead.

Line: 25 Column: 1 - 57
"...r> </div> <table border=0 width="100%" CELLPADDING=0 CELLSPACING=0> <tr v..." Line: 26 Column: 73 - 236
"...ign=right><table cellspacing=0 cellpadding=0 border=1 style="border: 1px; border-spacing: 0px; border-collapse: collapse; border-color: #003366; border-style: solid solid;" ><tr><t..."

Attribute “width” not allowed on element “tr” at this point.

Line: 26 Column: 58 - 38
"...SPACING=0> <tr valign=middle width=750 height=25><td></..."

Attribute “height” not allowed on element “tr” at this point.

Line: 26 Column: 58 - 38
"...SPACING=0> <tr valign=middle width=750 height=25><td></..."

The “valign” attribute on the “tr” element is obsolete. Use CSS instead.

Line: 26 Column: 58 - 38
"...SPACING=0> <tr valign=middle width=750 height=25><td></..." Line: 30 Column: 30 - 15
"...p half --> <tr valign=top> <td a..." Line: 35 Column: 74 - 15
"...</td></tr> <tr valign=top><td wi..." Line: 181 Column: 21 - 15
"...m half --> <tr valign=top> <!-- ..." Line: 220 Column: 17 - 20
"... id=sblok> <tr valign=top ><td wi..."

The “align” attribute on the “td” element is obsolete. Use CSS instead.

Line: 26 Column: 57 - 72
"...><td></td><td align=right><table..." Line: 26 Column: 241 - 315
"...id;" ><tr><td align=right style="background-image: url('/images/titlestreepje.jpg')">&nbsp;..." Line: 31 Column: 16 - 26
"...align=top> <td align=right width=255> <tabl..." Line: 33 Column: 5 - 104
"...blok> <tr><td width="100%" align="center" border=0 style="background-image: url('/images/titlestreepje.jpg')"> <b><f..." Line: 35 Column: 16 - 47
"...align=top><td width="100%" align="center"><p ali..." Line: 45 Column: 5 - 96
"...blok> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 47 Column: 5 - 36
"...</tr> <tr><td width="100%" align="center"><p ali..." Line: 58 Column: 9 - 100
"...> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 60 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 70 Column: 5 - 96
"...blok> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 72 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 80 Column: 9 - 99
"...> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"> <..." Line: 82 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 103 Column: 38 - 26
"...(image)--> <td align=right colspan=2> &nbsp..." Line: 183 Column: 21 - 26
"...column --> <td width=295 align=right> <tabl..." Line: 185 Column: 5 - 96
"...blok> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 187 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 201 Column: 9 - 100
"...> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 203 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 218 Column: 37 - 26
"...m half --> <td width=250 align=right> <tabl..." Line: 220 Column: 21 - 112
"...lign=top ><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 222 Column: 13 - 44
"... <tr><td width="100%" align="center"><p ali..." Line: 235 Column: 9 - 100
"...> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"> ..." Line: 238 Column: 7 - 38
"... <tr><td width="100%" align="center"><p ali..." Line: 239 Column: 7 - 38
"...tr> <tr><td width="100%" align="center"><p ali..." Line: 240 Column: 7 - 38
"...tr> <tr><td width="100%" align="center"><p ali..."

The “width” attribute on the “td” element is obsolete. Use CSS instead.

Line: 31 Column: 16 - 26
"...align=top> <td align=right width=255> <tabl..." Line: 33 Column: 5 - 104
"...blok> <tr><td width="100%" align="center" border=0 style="background-image: url('/images/titlestreepje.jpg')"> <b><f..." Line: 35 Column: 16 - 47
"...align=top><td width="100%" align="center"><p ali..." Line: 45 Column: 5 - 96
"...blok> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 47 Column: 5 - 36
"...</tr> <tr><td width="100%" align="center"><p ali..." Line: 58 Column: 9 - 100
"...> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 60 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 70 Column: 5 - 96
"...blok> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 72 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 80 Column: 9 - 99
"...> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"> <..." Line: 82 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 88 Column: 32 - 64
"...gn=center><td width="100%" halign="center"><p ali..." Line: 183 Column: 21 - 26
"...column --> <td width=295 align=right> <tabl..." Line: 185 Column: 5 - 96
"...blok> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 187 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 201 Column: 9 - 100
"...> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 203 Column: 9 - 40
"...> <tr><td width="100%" align="center"><p ali..." Line: 218 Column: 37 - 26
"...m half --> <td width=250 align=right> <tabl..." Line: 220 Column: 21 - 112
"...lign=top ><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"><b><fo..." Line: 222 Column: 13 - 44
"... <tr><td width="100%" align="center"><p ali..." Line: 235 Column: 9 - 100
"...> <tr><td width="100%" align="center" style="background-image: url('/images/titlestreepje.jpg')"> ..." Line: 238 Column: 7 - 38
"... <tr><td width="100%" align="center"><p ali..." Line: 239 Column: 7 - 38
"...tr> <tr><td width="100%" align="center"><p ali..." Line: 240 Column: 7 - 38
"...tr> <tr><td width="100%" align="center"><p ali..."

Attribute “border” not allowed on element “td” at this point.

Line: 33 Column: 5 - 104
"...blok> <tr><td width="100%" align="center" border=0 style="background-image: url('/images/titlestreepje.jpg')"> <b><f..."

The “align” attribute on the “p” element is obsolete. Use CSS instead.

Line: 35 Column: 48 - 63
"...="center"><p align="left"> <a cl..." Line: 47 Column: 37 - 52
"...="center"><p align="left"> <a c..." Line: 60 Column: 41 - 56
"...="center"><p align="left"> <..." Line: 72 Column: 41 - 56
"...="center"><p align="left"> D..." Line: 82 Column: 41 - 56
"...="center"><p align="left"> <..." Line: 88 Column: 65 - 89
"...="center"><p align="left" border=0> F..." Line: 187 Column: 41 - 56
"...="center"><p align="left"> <..." Line: 203 Column: 41 - 56
"...="center"><p align="left"> <..." Line: 222 Column: 45 - 60
"...="center"><p align="left"> ..." Line: 238 Column: 39 - 54
"...="center"><p align="left"> <a cl..." Line: 239 Column: 39 - 54
"...="center"><p align="left"><a cla..." Line: 240 Column: 39 - 54
"...="center"><p align="left"> <a cl..."

Duplicate ID “wblok”.

Line: 44 Column: 1 - 16
"...ble> <br> <table id=wblok> <tr><..." Line: 57 Column: 1 - 16
"...ble> <br> <table id=wblok> <..." Line: 69 Column: 1 - 16
"...ble> <br> <table id=wblok> <tr><..." Line: 79 Column: 1 - 16
"...ble> <br> <table id=wblok> <..." Line: 87 Column: 1 - 35
"...ble> <br> <table id=wblok style='border:0px'> <..." Line: 96 Column: 1 - 16
"...ble> <br> <table id=wblok> </..." Line: 184 Column: 1 - 16
"...gn=right> <table id=wblok> <tr><..." Line: 200 Column: 1 - 16
"...ble> <br> <table id=wblok> <..."

Attribute “border” not allowed on element “tr” at this point.

Line: 88 Column: 36 - 31
"...rder:0px'> <tr border=0 halign=center><td wi..."

Attribute “halign” not allowed on element “tr” at this point.

Line: 88 Column: 36 - 31
"...rder:0px'> <tr border=0 halign=center><td wi..."

Attribute “halign” not allowed on element “td” at this point.

Line: 88 Column: 32 - 64
"...gn=center><td width="100%" halign="center"><p ali..."

Attribute “border” not allowed on element “p” at this point.

Line: 88 Column: 65 - 89
"...="center"><p align="left" border=0> F..."

Bad value “30px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.

Line: 90 Column: 49 - 89
"...tzCenter/><img src=/images/facebook.jpg width=30px></a>&n..." Line: 91 Column: 43 - 82
"...ntzcenter><img src=/images/twitter.jpg width=30px></a>&n..." Line: 92 Column: 56 - 96
"...tz-center><img src=/images/linkedin.jpg width=30px></a> <..."

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Line: 90 Column: 49 - 89
"...tzCenter/><img src=/images/facebook.jpg width=30px></a>&n..." Line: 91 Column: 43 - 82
"...ntzcenter><img src=/images/twitter.jpg width=30px></a>&n..." Line: 92 Column: 56 - 96
"...tz-center><img src=/images/linkedin.jpg width=30px></a> <..."

Attribute “href” not allowed on element “span” at this point.

Line: 193 Column: 5 - 30
"...><br> <span class=front href="">Photo ..."

Stray end tag “a”.

Line: 221 Column: 34 - 37
"...University</a></font..." Line: 236 Column: 38 - 41
"...EA"> NEWS </a></font..."

Duplicate ID “sblok”.

Line: 234 Column: 1 - 16
"...ble> <br> <table id=sblok> <..."

Bad character “ ” after “<”. Probable cause: Unescaped “<”. Try escaping it as “&lt;”.

Line: 242 Column: - 4
".../a></tr> < <!..."

Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).

Line: 246 Column: - 9
"...></tr> <!--<tr><td width="..." Line: 248 Column: - 9
"...</tr> <!--<tr><td width="..." Line: 253 Column: - 6
"... <!--<tr><td width="..." Line: 256 Column: - 6
"... <!-- <tr><td width..."

Misplaced non-space characters inside a table.

Line: 256 Column: 123 - 210
"...r</a></tr> < <!--<tr><td width="100%" align="center"><p align="left"> <a class=front href="Lustrum.php">Lorentz Center 20 years</a></tr> <!--<tr><td width="100%" align="center"><p align="left"><a class=front href="https://www.universiteitleiden.nl/en/news/2016/12/lorentz-center-brings-together-scientists-from-all-disciplines">Opening common room</a></td></tr> <!--<tr><td width="100%" align="center"><p align="left"><a class=front href="http://www.tfc.tohoku.ac.jp/news/3730/">Collaboration TFC</a></td></tr> <!--<tr><td width="100%" align="center"><p align="left"><a class=front href="http://science.sciencemag.org/content/351/6275/818.full">Science publishes paper DLF Hommes </a></td></tr> <!-- <tr><td width="100%" align="center"><p align="left"><a class=front href="http://www.nwo.nl/actueel/nieuws/2015/nwo-verlengt-de-financiele-steun-voor-het-lorentz-center.html"> NWO funding granted </a> --> ..."

Cannot recover after last error. Any further errors will be ignored.

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"...r</a></tr> < <!--<tr><td width="100%" align="center"><p align="left"> <a class=front href="Lustrum.php">Lorentz Center 20 years</a></tr> <!--<tr><td width="100%" align="center"><p align="left"><a class=front href="https://www.universiteitleiden.nl/en/news/2016/12/lorentz-center-brings-together-scientists-from-all-disciplines">Opening common room</a></td></tr> <!--<tr><td width="100%" align="center"><p align="left"><a class=front href="http://www.tfc.tohoku.ac.jp/news/3730/">Collaboration TFC</a></td></tr> <!--<tr><td width="100%" align="center"><p align="left"><a class=front href="http://science.sciencemag.org/content/351/6275/818.full">Science publishes paper DLF Hommes </a></td></tr> <!-- <tr><td width="100%" align="center"><p align="left"><a class=front href="http://www.nwo.nl/actueel/nieuws/2015/nwo-verlengt-de-financiele-steun-voor-het-lorentz-center.html"> NWO funding granted </a> --> ..."

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lorentzcenter.nl 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.


lorentzcenter.nl 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.