Web Services Team Resources

WebTeam Resources

HTML5 Checklist


  • The document validates as XHTML 1.0 Transitional.
  • Code is cascaded for easy viewing
  • The Document weight is not greater than 32 KiloBites (KB).
    (You can view the document weight under the Tools menu. )
  • All tags are written in lowercase. Ex. <h1>, not <H1>.
  • All Attributes are written in lowercase and attribute values are written in lower case. Ex. <table class="table">
  • All tags must be closed, including empty elements, (start tag must end with />).
  • Filenames are in lowercase and do not contain spaces.

Headings and Titles

  • Every page has an <h1>.
  • Headings and Table Headings are in Title Case.
  • Never skip heading levels.
  • Each page has a title, <title></title>. In most cases, the title is the same as the <h1>.
  • An appropriate Heading tag has been inserted for each new section of the file.


  • All Tables inside a Div container (<div class="table-responsive"></div>)
  • All Table tags have a bootstrap table class (class="table table-bordered table-striped")
  • Tables that contain a Header, Body, and/or Footer should use the <thead>, <tbody>, and/or <tfoot>
  • In a single table, every table row <tr> has the same number of Table Data's <td>.

Special Characters - use character entity values

  • All quotes ( " and &#34; ) are replaced with &quot;
  • All ampersands ( & and &#38; ) are replaced with &amp;
  • All dollar signs ( $ and &#36; ) are replaced with &dollar;
  • All percent signs ( % and &#37; ) are replaced with &percnt;
  • All number signs ( # and &#35; ) are replaced with &num;
  • All non-breaking spaces ( &#160; ) are replaced with &nbsp;
  • All section symbols ( § and &#167; ) are replaced with &sect;
    more special characters

Deprecated Tags and Attributes

  • Do not use these deprecated tags and attributes
  • In particular look for the tags <font>, <center>, <frame>, <dir>
  • And the attributes scope, bgcolor, align, valign and nowrap
Contact Us

Massachusetts Department of Elementary and Secondary Education
75 Pleasant Street, Malden, MA 02148-4906

Voice: (781) 338-3000
TTY: (800) 439-2370


Disclaimer: A reference in this website to any specific commercial products, processes, or services, or the use of any trade, firm, or corporation name is for the information and convenience of the public and does not constitute endorsement or recommendation by the Massachusetts Department of Elementary and Secondary Education.