Errors:
Stray end tag “meta”.
A “charset” attribute on a “meta” element found after the first 1024 bytes.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate ID “mainnav”.
Duplicate ID “mn-home”.
Duplicate ID “mn-plan-your-adventure”.
Duplicate ID “mn-admission-and-tickets”.
Duplicate ID “mn-accessibility”.
Duplicate ID “mn-for-groups”.
Duplicate ID “mn-nonprofits”.
Duplicate ID “mn-donation-requests”.
Duplicate ID “mn-for-educators”.
Duplicate ID “mn-fieldtrips”.
Duplicate ID “mn-prek”.
Duplicate ID “mn-k2”.
Duplicate ID “mn-grades3-5”.
Duplicate ID “mn-grades6-8”.
Duplicate ID “mn-grades9-12”.
Duplicate ID “mn-planetarium-ed”.
Duplicate ID “mn-teacherpd”.
Duplicate ID “mn-outreach”.
Duplicate ID “mn-prek-outreach”.
Duplicate ID “mn-k2-outreach”.
Duplicate ID “mn-grades3-5-outreach”.
Duplicate ID “mn-grades6-8-outreach”.
Duplicate ID “mn-grades9-12-outreach”.
Duplicate ID “mn-famcom-outreach”.
Duplicate ID “mn-programrequest”.
Duplicate ID “mn-dining”.
Duplicate ID “mn-privateevents”.
Duplicate ID “mn-venue-and-meeting-space”.
Duplicate ID “mn-proposals-under-the-stars”.
Duplicate ID “mn-approved-vendors”.
Duplicate ID “mn-birthdays”.
Duplicate ID “mn-spark-science-emporium”.
Duplicate ID “mn-faq”.
Duplicate ID “mn-about-us”.
Duplicate ID “mn-meet-the-team”.
Duplicate ID “mn-meet-the-board”.
Duplicate ID “mn-newsroom”.
Duplicate ID “mn-join-the-team”.
Duplicate ID “mn-our-history”.
Duplicate ID “mn-connect”.
Duplicate ID “mn-enews”.
Duplicate ID “mn-see-and-do”.
Duplicate ID “mn-calendar”.
Duplicate ID “mn-permanent-exhibits”.
Duplicate ID “mn-adventuretower”.
Duplicate ID “mn-beekeeping”.
Duplicate ID “mn-earthquake”.
Duplicate ID “mn-bluemax”.
Duplicate ID “mn-bodyquest”.
Duplicate ID “mn-destinationexploration”.
Duplicate ID “mn-dinorumble”.
Duplicate ID “mn-plasma”.
Duplicate ID “mn-galacticgardens”.
Duplicate ID “mn-imaginationplayground”.
Duplicate ID “mn-i2”.
Duplicate ID “mn-nano”.
Duplicate ID “mn-flight”.
Duplicate ID “mn-physicsoflight”.
Duplicate ID “mn-spacechase”.
Duplicate ID “mn-tsunami”.
Duplicate ID “mn-vaporvortex”.
Duplicate ID “mn-virtualreality”.
Duplicate ID “mn-travelingexhibitions”.
Duplicate ID “mn-beyondrubikscube”.
Duplicate ID “mn-comingsoon”.
Duplicate ID “mn-sudekum-planetarium”.
Duplicate ID “mn-show-schedule”.
Duplicate ID “mn-special-shows”.
Duplicate ID “mn-starcharts”.
Duplicate ID “mn-activities”.
Duplicate ID “mn-for-everyone”.
Duplicate ID “mn-sciencelive”.
Duplicate ID “mn-whistlestop”.
Duplicate ID “mn-kids-and-teens”.
Duplicate ID “mn-explorers”.
Duplicate ID “mn-i2makerlabs”.
Duplicate ID “mn-camps”.
Duplicate ID “mn-scouts”.
Duplicate ID “mn-sleepovers”.
Duplicate ID “mn-twister”.
Duplicate ID “mn-youthcr3w”.
Duplicate ID “mn-adults”.
Duplicate ID “mn-yoga”.
Duplicate ID “mn-special-events”.
Duplicate ID “mn-madbash”.
Duplicate ID “mn-4thofjuly”.
Duplicate ID “mn-romance”.
Duplicate ID “mn-scienceofbeer”.
Duplicate ID “mn-waylate”.
Duplicate ID “mn-art”.
Duplicate ID “mn-explore-science”.
Duplicate ID “mn-blog”.
Duplicate ID “mn-diyscience”.
Duplicate ID “mn-join-and-give”.
Duplicate ID “mn-membership”.
Duplicate ID “mn-become-a-member”.
Duplicate ID “mn-benefits”.
Duplicate ID “mn-renew”.
Duplicate ID “mn-giftmemberships”.
Duplicate ID “mn-policies”.
Duplicate ID “mn-donate”.
Duplicate ID “mn-discoverysociety”.
Duplicate ID “mn-monthlygiving”.
Duplicate ID “mn-donate17”.
Duplicate ID “mn-planned-giving”.
Duplicate ID “mn-tribute”.
Duplicate ID “mn-corporategiving”.
Duplicate ID “mn-businesscircle”.
Duplicate ID “mn-sponsorship-opportunities”.
Duplicate ID “mn-businesscirclesupporters”.
Duplicate ID “mn-volunteer”.
Duplicate ID “mn-become-a-volunteer”.
Duplicate ID “mn-scientists”.
Duplicate ID “mn-internships”.
Bad value “1” for attribute “rel” on element “a”: The string “1” is not a registered keyword.
Bad value “2” for attribute “rel” on element “a”: The string “2” is not a registered keyword.
Bad value “3” for attribute “rel” on element “a”: The string “3” is not a registered keyword.
Bad value “4” for attribute “rel” on element “a”: The string “4” is not a registered keyword.
Bad value “5” for attribute “rel” on element “a”: The string “5” is not a registered keyword.
The “font” element is obsolete. Use CSS instead.
End tag “footer” seen, but there were open elements.
Unclosed element “div”.
End tag “div” seen, but there were open elements.
Unclosed element “span”.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Warnings:
The first occurrence of ID “mainnav” was here.
The first occurrence of ID “mn-home” was here.
The first occurrence of ID “mn-plan-your-adventure” was here.
The first occurrence of ID “mn-admission-and-tickets” was here.
The first occurrence of ID “mn-accessibility” was here.
The first occurrence of ID “mn-for-groups” was here.
The first occurrence of ID “mn-nonprofits” was here.
The first occurrence of ID “mn-donation-requests” was here.
The first occurrence of ID “mn-for-educators” was here.
The first occurrence of ID “mn-fieldtrips” was here.
The first occurrence of ID “mn-prek” was here.
The first occurrence of ID “mn-k2” was here.
The first occurrence of ID “mn-grades3-5” was here.
The first occurrence of ID “mn-grades6-8” was here.
The first occurrence of ID “mn-grades9-12” was here.
The first occurrence of ID “mn-planetarium-ed” was here.
The first occurrence of ID “mn-teacherpd” was here.
The first occurrence of ID “mn-outreach” was here.
The first occurrence of ID “mn-prek-outreach” was here.
The first occurrence of ID “mn-k2-outreach” was here.
The first occurrence of ID “mn-grades3-5-outreach” was here.
The first occurrence of ID “mn-grades6-8-outreach” was here.
The first occurrence of ID “mn-grades9-12-outreach” was here.
The first occurrence of ID “mn-famcom-outreach” was here.
The first occurrence of ID “mn-programrequest” was here.
The first occurrence of ID “mn-dining” was here.
The first occurrence of ID “mn-privateevents” was here.
The first occurrence of ID “mn-venue-and-meeting-space” was here.
The first occurrence of ID “mn-proposals-under-the-stars” was here.
The first occurrence of ID “mn-approved-vendors” was here.
The first occurrence of ID “mn-birthdays” was here.
The first occurrence of ID “mn-spark-science-emporium” was here.
The first occurrence of ID “mn-faq” was here.
The first occurrence of ID “mn-about-us” was here.
The first occurrence of ID “mn-meet-the-team” was here.
The first occurrence of ID “mn-meet-the-board” was here.
The first occurrence of ID “mn-newsroom” was here.
The first occurrence of ID “mn-join-the-team” was here.
The first occurrence of ID “mn-our-history” was here.
The first occurrence of ID “mn-connect” was here.
The first occurrence of ID “mn-enews” was here.
The first occurrence of ID “mn-see-and-do” was here.
The first occurrence of ID “mn-calendar” was here.
The first occurrence of ID “mn-permanent-exhibits” was here.
The first occurrence of ID “mn-adventuretower” was here.
The first occurrence of ID “mn-beekeeping” was here.
The first occurrence of ID “mn-earthquake” was here.
The first occurrence of ID “mn-bluemax” was here.
The first occurrence of ID “mn-bodyquest” was here.
The first occurrence of ID “mn-destinationexploration” was here.
The first occurrence of ID “mn-dinorumble” was here.
The first occurrence of ID “mn-plasma” was here.
The first occurrence of ID “mn-galacticgardens” was here.
The first occurrence of ID “mn-imaginationplayground” was here.
The first occurrence of ID “mn-i2” was here.
The first occurrence of ID “mn-nano” was here.
The first occurrence of ID “mn-flight” was here.
The first occurrence of ID “mn-physicsoflight” was here.
The first occurrence of ID “mn-spacechase” was here.
The first occurrence of ID “mn-tsunami” was here.
The first occurrence of ID “mn-vaporvortex” was here.
The first occurrence of ID “mn-virtualreality” was here.
The first occurrence of ID “mn-travelingexhibitions” was here.
The first occurrence of ID “mn-beyondrubikscube” was here.
The first occurrence of ID “mn-comingsoon” was here.
The first occurrence of ID “mn-sudekum-planetarium” was here.
The first occurrence of ID “mn-show-schedule” was here.
The first occurrence of ID “mn-special-shows” was here.
The first occurrence of ID “mn-starcharts” was here.
The first occurrence of ID “mn-activities” was here.
The first occurrence of ID “mn-for-everyone” was here.
The first occurrence of ID “mn-sciencelive” was here.
The first occurrence of ID “mn-whistlestop” was here.
The first occurrence of ID “mn-kids-and-teens” was here.
The first occurrence of ID “mn-explorers” was here.
The first occurrence of ID “mn-i2makerlabs” was here.
The first occurrence of ID “mn-camps” was here.
The first occurrence of ID “mn-scouts” was here.
The first occurrence of ID “mn-sleepovers” was here.
The first occurrence of ID “mn-twister” was here.
The first occurrence of ID “mn-youthcr3w” was here.
The first occurrence of ID “mn-adults” was here.
The first occurrence of ID “mn-yoga” was here.
The first occurrence of ID “mn-special-events” was here.
The first occurrence of ID “mn-madbash” was here.
The first occurrence of ID “mn-4thofjuly” was here.
The first occurrence of ID “mn-romance” was here.
The first occurrence of ID “mn-scienceofbeer” was here.
The first occurrence of ID “mn-waylate” was here.
The first occurrence of ID “mn-art” was here.
The first occurrence of ID “mn-explore-science” was here.
The first occurrence of ID “mn-blog” was here.
The first occurrence of ID “mn-diyscience” was here.
The first occurrence of ID “mn-join-and-give” was here.
The first occurrence of ID “mn-membership” was here.
The first occurrence of ID “mn-become-a-member” was here.
The first occurrence of ID “mn-benefits” was here.
The first occurrence of ID “mn-renew” was here.
The first occurrence of ID “mn-giftmemberships” was here.
The first occurrence of ID “mn-policies” was here.
The first occurrence of ID “mn-donate” was here.
The first occurrence of ID “mn-discoverysociety” was here.
The first occurrence of ID “mn-monthlygiving” was here.
The first occurrence of ID “mn-donate17” was here.
The first occurrence of ID “mn-planned-giving” was here.
The first occurrence of ID “mn-tribute” was here.
The first occurrence of ID “mn-corporategiving” was here.
The first occurrence of ID “mn-businesscircle” was here.
The first occurrence of ID “mn-sponsorship-opportunities” was here.
The first occurrence of ID “mn-businesscirclesupporters” was here.
The first occurrence of ID “mn-volunteer” was here.
The first occurrence of ID “mn-become-a-volunteer” was here.
The first occurrence of ID “mn-scientists” was here.
The first occurrence of ID “mn-internships” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
United States US