basisonderwijs.online Website Information

Daily Unique Visits: 2,374

Daily Page Views: 7,122

Income Per Day: $21

Estimated Value: $7,560

basisonderwijs.online is registered under .ONLINE top-level domain. Please check other sites in .ONLINE zone.

No name server records were found.

and is probably hosted by LeaseWeb Netherlands B.V.. See the full list of other websites hosted by LeaseWeb Netherlands B.V..

The highest website basisonderwijs.online position in Alexa rank database was 20147 and the lowest rank position was 986359. Current position of basisonderwijs.online in Alexa rank database is 453151.

Desktop speed score of basisonderwijs.online (72/100) is better than the results of 54.39% of other sites and shows that the page desktop performance can be improved.

Mobile usability score of basisonderwijs.online (68/100) is better than the results of 19.67% of other sites and means that the page is not mobile-friendly.

Mobile speed score of basisonderwijs.online (58/100) is better than the results of 50.23% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.

basisonderwijs.online 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.

basisonderwijs.online 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.

basisonderwijs.online domain is not supported

basisonderwijs.online server information

Servers Location

basisonderwijs.online desktop page speed rank

Last tested: 2018-06-03

Desktop Speed Medium

72/100

basisonderwijs.online Desktop Speed Test Quick Summary

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priority - 11Leverage browser caching

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

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priority - 3Avoid landing page redirects

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priority - 0Minify HTML

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priority - 0Minify JavaScript

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basisonderwijs.online Desktop Resource Breakdown

Total Resources	49
Number of Hosts	5
Static Resources	36
JavaScript Resources	12
CSS Resources	4

basisonderwijs.online mobile page speed rank

Last tested: 2018-06-03

Mobile Speed Bad

58/100

basisonderwijs.online Mobile Speed Test Quick Summary

priority - 32Eliminate render-blocking JavaScript and CSS in above-the-fold content

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priority - 17Leverage browser caching

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priority - 10Avoid landing page redirects

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priority - 3Reduce server response time

priority - 0Minify CSS

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priority - 0Minify HTML

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priority - 0Minify JavaScript

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basisonderwijs.online Mobile Resource Breakdown

Total Resources	66
Number of Hosts	9
Static Resources	43
JavaScript Resources	19
CSS Resources	4

basisonderwijs.online mobile page usability

Last tested: 2018-06-03

Mobile Usability Medium

68/100

basisonderwijs.online Mobile Usability Test Quick Summary

priority - 20Use 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.

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Portalengroep.…ites wijzigen? renders only 5 pixels tall (14 CSS pixels).

Klik dan hier…er informatie. renders only 5 pixels tall (14 CSS pixels).

Ja, ik geef toestemming renders only 6 pixels tall (16 CSS pixels).

Leermiddelen renders only 6 pixels tall (16 CSS pixels).

1-2 and 2 others render only 6 pixels tall (16 CSS pixels).

3-8 renders only 6 pixels tall (16 CSS pixels).

Lespakketten and 3 others render only 6 pixels tall (16 CSS pixels).

Schoolreizen and 2 others render only 6 pixels tall (16 CSS pixels).

(vak)gebieden renders only 4 pixels tall (11 CSS pixels).

schooltv in de klas and 23 others render only 4 pixels tall (11 CSS pixels).

verwijder selectie renders only 4 pixels tall (11 CSS pixels).

Actueel school…schoolreisjes and 9 others render only 4 pixels tall (11 CSS pixels).

lespakket/informatie/oefenen and 9 others render only 4 pixels tall (10 CSS pixels).

webwijzer zomer and 10 others render only 4 pixels tall (10 CSS pixels).

Lesmateriaal v…tegen de zon. renders only 4 pixels tall (10 CSS pixels).

Inloggen renders only 4 pixels tall (11 CSS pixels).

Gratis account aanmaken renders only 4 pixels tall (11 CSS pixels).

Toon ook de tools van: renders only 4 pixels tall (11 CSS pixels).

i3LEARNHUB and 2 others render only 4 pixels tall (11 CSS pixels).

informatie over deze functie renders only 4 pixels tall (10 CSS pixels).

Schrijf u in v…ze nieuwsbrief and 3 others render only 5 pixels tall (13 CSS pixels).

landings.ie.edu renders only 6 pixels tall (15 CSS pixels).

Facebook and 2 others render only 5 pixels tall (12 CSS pixels).

Algemene voorwaarden and 4 others render only 5 pixels tall (13 CSS pixels).

priority - 16Size tap targets appropriately

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The tap target <span class="cookieMoreInfoClick">Klik dan hier…er informatie.</span> is close to 2 other tap targets.

The tap target <button class="my-close-button">Ja, ik geef toestemming</button> is close to 2 other tap targets.

The tap target <a href="https://kleute…erwijs.online/">1-2</a> and 2 others are close to other tap targets.

The tap target <a href="https://basisonderwijs.online">3-8</a> is close to 2 other tap targets.

The tap target <a href="https://apps.b…erwijs.online/">Apps</a> is close to 2 other tap targets.

The tap target <input id="searchfield" type="text" name="zoeken"> is close to 2 other tap targets.

The tap target <input id="submit-search" type="submit"> is close to 2 other tap targets.

The tap target <a href="#">(vak)gebieden</a> is close to 3 other tap targets.

The tap target <a href="/schoolborden/…ebied=algemeen">algemeen</a> and 23 others are close to other tap targets.

The tap target <input type="checkbox"> and 23 others are close to other tap targets.

The tap target <a id="verwijder-selectie" href="/">verwijder selectie</a> is close to 1 other tap targets.

The tap target <a href="/schoolborden/…ebied=algemeen">Algemeen lesmateriaal</a> and 8 others are close to other tap targets.

The tap target <a href="/schoolborden/aanmelden.html" class="grey">favoriet</a> and 19 others are close to other tap targets.

The tap target <a href="/schoolborden/aanmelden.html" class="grey">favoriet</a> and 10 others are close to other tap targets.

The tap target <a href="/schoolborden/…gebied=rekenen"></a> is close to 1 other tap targets.

The tap target <p class="tool-favorite-grey">favoriet</p> and 1 others are close to other tap targets.

The tap target <a href="/schoolborden/inloggen.html">Inloggen</a> is close to 1 other tap targets.

The tap target <a href="/schoolborden/aanmelden.html">Gratis account aanmaken</a> is close to 1 other tap targets.

The tap target <input id="gynzy" type="checkbox" name="merklayer[]"> and 2 others are close to other tap targets.

The tap target <label for="gynzy">Gynzy</label> and 2 others are close to other tap targets.

The tap target <a href="/gynzy-en-prow…rdportaal.html">informatie over deze functie</a> is close to 4 other tap targets.

The tap target <div id="abgc" class="abgc">Info</div> is close to 1 other tap targets.

The tap target <a href="https://twitte…/Portalengroep">Twitter</a> and 1 others are close to other tap targets.

The tap target <a href="https://basiso…statement.html">Privacy</a> and 1 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.

basisonderwijs.online HTML validation

Errors

Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)

Line: 1 Column: - 2
"...<?xml version="1..."

Obsolete doctype. Expected “<!DOCTYPE html>”.

Line: 2 Column: 39 - 48
"...="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <htm..."

When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.

Line: 4 Column: 49 - 137
"...ml11.dtd"> <html class="standaardportaal schoolbordportaal" xmlns="http://www.w3.org/1999/xhtml" version="-//W3C//DTD XHTML 1.1//EN" xml:lang="en"> <head..."

The “version” attribute on the “html” element is obsolete. You can safely omit it.

Line: 4 Column: 49 - 137
"...ml11.dtd"> <html class="standaardportaal schoolbordportaal" xmlns="http://www.w3.org/1999/xhtml" version="-//W3C//DTD XHTML 1.1//EN" xml:lang="en"> <head..."

The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.

Line: 5 Column: 138 - 50
"...lang="en"> <head profile="http://www.w3.org/2005/10/profile"> <met..."

Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)

Line: 34 Column: 3 - 9
"...script> <style> .co..."

Duplicate ID “site-button”.

Line: 127 Column: 204 - 241
"....online/"><span id="site-button" class="child ">1-2</s..." Line: 127 Column: 296 - 339
"...s.online"><span id="site-button" class="child active">3-8</s..." Line: 127 Column: 406 - 437
"...s.online"><span id="site-button" class="">Werkbo..." Line: 127 Column: 513 - 544
"...s.online"><span id="site-button" class="">Lespak..." Line: 127 Column: 580 - 624
"... href="#"><span id="site-button" class="not-available">School..." Line: 127 Column: 699 - 730
"....online/"><span id="site-button" class="">Vacatu..." Line: 127 Column: 763 - 807
"... href="#"><span id="site-button" class="not-available">Nieuws..." Line: 127 Column: 875 - 906
"....online/"><span id="site-button" class="">Musica..." Line: 127 Column: 988 - 1019
"....online/"><span id="site-button" class="">Theate..." Line: 127 Column: 1084 - 1115
"....online/"><span id="site-button" class="">Apps</..." Line: 127 Column: 1184 - 1221
"....online/"><span id="site-button" class="child ">1-2</s..." Line: 127 Column: 1282 - 1319
"....online/"><span id="site-button" class="child ">3-8</s..."

The element “input” must not appear as a descendant of the “a” element.

Line: 149 Column: 95 - 119
"...algemeen"><input type="checkbox" /><label..." Line: 150 Column: 65 - 89
"...elletjes"><input type="checkbox" /><label..." Line: 151 Column: 62 - 86
"...=actueel"><input type="checkbox" /><label..." Line: 152 Column: 62 - 86
"...=rekenen"><input type="checkbox" /><label..." Line: 153 Column: 59 - 83
"...ied=taal"><input type="checkbox" /><label..." Line: 154 Column: 60 - 84
"...ed=lezen"><input type="checkbox" /><label..." Line: 155 Column: 61 - 85
"...d=engels"><input type="checkbox" /><label..." Line: 156 Column: 69 - 93
"...jkskunde"><input type="checkbox" /><label..." Line: 157 Column: 67 - 91
"...hiedenis"><input type="checkbox" /><label..." Line: 158 Column: 63 - 87
"...biologie"><input type="checkbox" /><label..." Line: 159 Column: 63 - 87
"...techniek"><input type="checkbox" /><label..." Line: 160 Column: 64 - 88
"...chrijven"><input type="checkbox" /><label..." Line: 161 Column: 62 - 86
"...=verkeer"><input type="checkbox" /><label..." Line: 162 Column: 61 - 85
"...d=muziek"><input type="checkbox" /><label..." Line: 163 Column: 73 - 97
"...otioneel"><input type="checkbox" /><label..." Line: 164 Column: 68 - 92
"...wijsheid"><input type="checkbox" /><label..." Line: 165 Column: 70 - 94
"...rdigheid"><input type="checkbox" /><label..." Line: 166 Column: 62 - 86
"...=tekenen"><input type="checkbox" /><label..." Line: 167 Column: 68 - 92
"...en-drama"><input type="checkbox" /><label..." Line: 168 Column: 73 - 97
"...nderwijs"><input type="checkbox" /><label..." Line: 169 Column: 65 - 89
"...dsdienst"><input type="checkbox" /><label..." Line: 170 Column: 71 - 95
"...software"><input type="checkbox" /><label..." Line: 171 Column: 74 - 98
"...-de-klas"><input type="checkbox" /><label..." Line: 172 Column: 67 - 91
"...akketten"><input type="checkbox" /><label..." Line: 195 Column: 851 - 925
"...ss="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favor..." Line: 200 Column: 860 - 934
"...ss="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favor..." Line: 205 Column: 836 - 910
"...ss="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favor..." Line: 210 Column: 830 - 904
"...ss="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favor..." Line: 215 Column: 759 - 833
"...ss="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favor..." Line: 220 Column: 745 - 819
"...ss="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favor..." Line: 225 Column: 749 - 823
"...ss="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favor..." Line: 230 Column: 861 - 935
"...s="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favori..." Line: 235 Column: 883 - 957
"...s="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favori..." Line: 240 Column: 988 - 1062
"...ss="grey"><input type="checkbox" name="favoriet" value="" class="toolfavoritegrey" /> favor..."

Bad value “” for attribute “for” on element “label”: An ID must not be the empty string.

Line: 149 Column: 120 - 133
"...eckbox" /><label for=""></labe..." Line: 150 Column: 90 - 103
"...eckbox" /><label for=""></labe..." Line: 151 Column: 87 - 100
"...eckbox" /><label for=""></labe..." Line: 152 Column: 87 - 100
"...eckbox" /><label for=""></labe..." Line: 153 Column: 84 - 97
"...eckbox" /><label for=""></labe..." Line: 154 Column: 85 - 98
"...eckbox" /><label for=""></labe..." Line: 155 Column: 86 - 99
"...eckbox" /><label for=""></labe..." Line: 156 Column: 94 - 107
"...eckbox" /><label for=""></labe..." Line: 157 Column: 92 - 105
"...eckbox" /><label for=""></labe..." Line: 158 Column: 88 - 101
"...eckbox" /><label for=""></labe..." Line: 159 Column: 88 - 101
"...eckbox" /><label for=""></labe..." Line: 160 Column: 89 - 102
"...eckbox" /><label for=""></labe..." Line: 161 Column: 87 - 100
"...eckbox" /><label for=""></labe..." Line: 162 Column: 86 - 99
"...eckbox" /><label for=""></labe..." Line: 163 Column: 98 - 111
"...eckbox" /><label for=""></labe..." Line: 164 Column: 93 - 106
"...eckbox" /><label for=""></labe..." Line: 165 Column: 95 - 108
"...eckbox" /><label for=""></labe..." Line: 166 Column: 87 - 100
"...eckbox" /><label for=""></labe..." Line: 167 Column: 93 - 106
"...eckbox" /><label for=""></labe..." Line: 168 Column: 98 - 111
"...eckbox" /><label for=""></labe..." Line: 169 Column: 90 - 103
"...eckbox" /><label for=""></labe..." Line: 170 Column: 96 - 109
"...eckbox" /><label for=""></labe..." Line: 171 Column: 99 - 112
"...eckbox" /><label for=""></labe..." Line: 172 Column: 92 - 105
"...eckbox" /><label for=""></labe..."

The element “label” must not appear as a descendant of the “a” element.

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

Line: 243 Column: 23 - 30
"...googlead"><center> <..." Line: 279 Column: 10 - 17
"... <center> <..." Line: 285 Column: 728 - 735
"...</p></div><center> <d..." Line: 336 Column: 45 - 52
"...="footer"><center> <..."

Bad value “28px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.

Bad value “28px” for attribute “height” on element “img”: Expected a digit but saw “p” instead.

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

Line: 264 Column: 92 - 226
"...="_blank"><img src="https://basisonderwijs.online/data/ftpstorage/footerimages/twitter_icon_rd.png" width="28px" height="28px" class="nostyle" /></a></..." Line: 265 Column: 124 - 259
"...="_blank"><img src="https://basisonderwijs.online/data/ftpstorage/footerimages/facebook_icon_rd.png" width="28px" height="28px" class="nostyle" /></a></..." Line: 266 Column: 113 - 248
"...="_blank"><img src="https://basisonderwijs.online/data/ftpstorage/footerimages/linkedin_icon_rd.png" width="28px" height="28px" class="nostyle" /></a></..." Line: 280 Column: 249 - 402
"...4px 0px;"><img src="https://basisonderwijs.online/data/ftpstorage/loginbuttonlogo.png" style="width: 45px; float: right; margin: 4px 4px 0px 0px;" class="nostyle"/></div>..." Line: 287 Column: 38 - 163
"...ord.html"><img class="mandatory-tool" width="78px" src="https://basisonderwijs.online/data/ftpstorage/mandatory-tools-schoolbord.jpg" /></a> ..." Line: 288 Column: 94 - 215
"...enu.html"><img class="mandatory-tool" width="78px" src="https://basisonderwijs.online/data/ftpstorage/mandatory-tools-timers.jpg" /></a> ..." Line: 358 Column: 92 - 226
"...="_blank"><img src="https://basisonderwijs.online/data/ftpstorage/footerimages/twitter_icon_rd.png" width="28px" height="28px" class="nostyle" /></a></..." Line: 359 Column: 124 - 259
"...="_blank"><img src="https://basisonderwijs.online/data/ftpstorage/footerimages/facebook_icon_rd.png" width="28px" height="28px" class="nostyle" /></a></..." Line: 360 Column: 113 - 248
"...="_blank"><img src="https://basisonderwijs.online/data/ftpstorage/footerimages/linkedin_icon_rd.png" width="28px" height="28px" class="nostyle" /></a></..."

Stray end tag “a”.

Line: 264 Column: 332 - 335
"...</a></div></a> ..." Line: 358 Column: 332 - 335
"...</a></div></a> ..."

Duplicate ID “account-button”.

Line: 281 Column: 44 - 81
"...den.html"><div id="account-button" class="last">Gratis..."

Bad value “78px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.

Line: 287 Column: 38 - 163
"...ord.html"><img class="mandatory-tool" width="78px" src="https://basisonderwijs.online/data/ftpstorage/mandatory-tools-schoolbord.jpg" /></a> ..." Line: 288 Column: 94 - 215
"...enu.html"><img class="mandatory-tool" width="78px" src="https://basisonderwijs.online/data/ftpstorage/mandatory-tools-timers.jpg" /></a> ..."

Element “script” must not have attribute “charset” unless attribute “src” is also specified.

Line: 294 Column: 4 - 50
"...</div> <script type="text/javascript" charset="utf-8"> $(..." Line: 300 Column: 1 - 47
"... </div> <script type="text/javascript" charset="utf-8"> //<!..."

Duplicate ID “footerr”.

Line: 337 Column: 5 - 56
"...nter> <div id="footerr" style="margin: 10px 0px 0px 0px;"> <di..."

Duplicate ID “links”.

Line: 338 Column: 3 - 18
"... 0px;"> <div id="links"> ..."

Duplicate ID “socials”.

Line: 357 Column: 9 - 26
"... <div id="socials"> ..."

Duplicate ID “misc”.

Line: 362 Column: 9 - 23
"...> <div id="misc"> ..."

The “for” attribute of the “label” element must refer to a non-hidden form control.

Warnings

The first occurrence of ID “site-button” was here.

Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..." Line: 127 Column: 93 - 130
"...tgelicht"><span id="site-button" class="active">Leermi..."

The first occurrence of ID “account-button” was here.

Line: 280 Column: 43 - 67
"...gen.html"><div id="account-button">Inlogg..."

The first occurrence of ID “footerr” was here.

Line: 244 Column: 5 - 57
"...nter> <div id="footerr" style="margin: 10px 0px 30px 0px;"> ..."

The first occurrence of ID “links” was here.

Line: 245 Column: 9 - 24
"...> <div id="links"> ..."

The first occurrence of ID “socials” was here.

Line: 263 Column: 9 - 26
"...> <div id="socials"> ..."

The first occurrence of ID “misc” was here.

Line: 268 Column: 9 - 23
"...> <div id="misc"> ..."

This document appears to be written in Dutch. Consider adding “lang="nl"” (or variant) to the “html” start tag.

Line: 4 Column: 49 - 137
"...ml11.dtd"> <html class="standaardportaal schoolbordportaal" xmlns="http://www.w3.org/1999/xhtml" version="-//W3C//DTD XHTML 1.1//EN" xml:lang="en"> <head..."

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priority - 16Optimize images

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

Optimize the following images to reduce their size by 158.2KiB (75% reduction).

priority - 11Leverage 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 - 8Eliminate 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:

Optimize CSS Delivery of the following:

priority - 3Avoid 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.

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 863B (15% reduction).

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 585B (11% 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 414B (31% reduction).

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basisonderwijs.online Mobile Speed Test Quick Summary

priority - 32Eliminate 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:

Optimize CSS Delivery of the following:

priority - 17Leverage 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 - 15Optimize images

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

Optimize the following images to reduce their size by 144KiB (71% reduction).

priority - 10Avoid 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.

priority - 3Reduce server response time

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 863B (15% reduction).

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 585B (11% reduction).

priority - 0Minify JavaScript

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

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priority - 20Use legible font sizes

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basisonderwijs.online HTML validation

Errors

Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)

Obsolete doctype. Expected “<!DOCTYPE html>”.

When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.

The “version” attribute on the “html” element is obsolete. You can safely omit it.

The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.

Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)

Duplicate ID “site-button”.

The element “input” must not appear as a descendant of the “a” element.

Bad value “” for attribute “for” on element “label”: An ID must not be the empty string.

The element “label” must not appear as a descendant of the “a” element.