This tool is an ongoing experiment in better HTML checking, and its behavior remains subject to change
Error: 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.
From line 25, column 1; to line 25, column 69
</script>↩<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />↩ <me
Warning: The navigation role is unnecessary for element nav.
From line 79, column 5; to line 79, column 164
eft">↩ <nav class="top-bar" data-topbar data-options="is_hover:true;custom_back_text:true;back_text:f;mobile_show_parent_link:true;scrolltop:false;" role="navigation">↩
Warning: Empty heading.
From line 88, column 29; to line 88, column 67
<h1 class="site-title font-family-h1 ">↩
Error: Bad value navigation for attribute role on element ul.
From line 113, column 5; to line 113, column 48
↩↩↩↩↩↩ <ul class="menu dropdown" role="navigation"><li cl
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 49; to line 113, column 96
vigation"><li class="active has-dropdown" role="menuitem"><a hre
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 123; to line 113, column 163
e</a></li><li class="has-dropdown" role="menuitem"><a hre
Error: Bad value navigation for attribute role on element ul.
From line 113, column 200; to line 113, column 243
out Us</a><ul class="menu dropdown" role="navigation"><li cl
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 244; to line 113, column 284
vigation"><li class="has-dropdown" role="menuitem"><a hre
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 339; to line 113, column 379
p</a></li><li class="has-dropdown" role="menuitem"><a hre
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 436; to line 113, column 476
</ul></li><li class="has-dropdown" role="menuitem"><a hre
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 521; to line 113, column 561
s</a></li><li class="has-dropdown" role="menuitem"><a hre
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 606; to line 113, column 646
s</a></li><li class="has-dropdown" role="menuitem"><a hre
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 697; to line 113, column 737
e</a></li><li class="has-dropdown" role="menuitem"><a hre
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 776; to line 113, column 816
T</a></li><li class="has-dropdown" role="menuitem"><a hre
Error: An element with role=menuitem must be contained in, or owned by, an element with role=menubar or role=menu.
From line 113, column 862; to line 113, column 902
s</a></li><li class="has-dropdown" role="menuitem"><a hre
Warning: Section lacks heading. Consider using h2-h6 elements to add identifying headings to all sections.
From line 105, column 9; to line 105, column 66
↩↩ <section class="top-bar-section font-family-text menu-rw">↩↩↩↩↩↩
Error: Bad value for attribute target on element a: Browsing context name must be at least one character long.
From line 155, column 3; to line 155, column 92
tack'>↩↩ <a role="button" href="about/chupacabra/" class=" button centered " target="" rel="">Learn
Error: Bad value for attribute target on element a: Browsing context name must be at least one character long.
From line 172, column 3; to line 172, column 81
tack'>↩↩ <a role="button" href="about/" class=" button centered " target="" rel="">Read M
Error: Attribute webkitallowfullscreen not allowed on element iframe at this point.
From line 212, column 47; to line 212, column 175
utube"> <iframe src="https://www.youtube.com/embed/EMiNmJW7enI" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></ifra
iframe:src - Address of the resource
srcdoc - A document to render in the iframe
name - Name of nested browsing context
sandbox - Security rules for nested content
allowfullscreen - Whether to allow the iframe’s
contents to use requestFullscreen()
allowpaymentrequest - Whether the iframe’s
contents are allowed to use the PaymentRequest interface
to make payment requests
width - Horizontal dimension
height - Vertical dimension
Error: Attribute mozallowfullscreen not allowed on element iframe at this point.
From line 212, column 47; to line 212, column 175
utube"> <iframe src="https://www.youtube.com/embed/EMiNmJW7enI" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></ifra
iframe:src - Address of the resource
srcdoc - A document to render in the iframe
name - Name of nested browsing context
sandbox - Security rules for nested content
allowfullscreen - Whether to allow the iframe’s
contents to use requestFullscreen()
allowpaymentrequest - Whether the iframe’s
contents are allowed to use the PaymentRequest interface
to make payment requests
width - Horizontal dimension
height - Vertical dimension
Error: The frameborder attribute on the iframe element is obsolete. Use CSS instead.
From line 212, column 47; to line 212, column 175
utube"> <iframe src="https://www.youtube.com/embed/EMiNmJW7enI" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></ifra
Error: Bad value for attribute target on element a: Browsing context name must be at least one character long.
From line 220, column 3; to line 220, column 108
tack'>↩↩ <a role="button" href="http://www.firstinspires.org/robotics/frc" class=" button " target="" rel="">Learn
There were errors.
Used the schema for HTML with SVG 1.1, MathML 3.0, RDFa 1.1, and ITS 2.0 support.
Used the HTML parser.
Total execution time 440 milliseconds.
About this checker • Report an issue • Version: 17.2.0