Tags appear within {% tagname %} markup. Matching end-tags are shown in brackets.

GitHub pages use Jekyll which in turn uses Liquid. See also the official tags reference.

Control flow tags

  • case (when, else, endcase) - a switch statement

  • if (else, elsif, endif) - execute block only if the condition is met

    Note the odd spelling of elsif (e.g. no second e)

    Conditional tests support and and or to link conditions together e.g. {% if line_item.grams > 20000 and customer_address.city == 'Ottawa' %}

  • raw (endraw) - stops Liquid from parsing the content so that you can include double braces for example.
  • unless (endunless) - execute block only if the condition is not met

Iteration tags

  • cycle - must be used in a for-loop. Cycles through the parameters e.g. {% cycle 'a', 'b' %} {% cycle 'a', 'b' %} {% cycle 'a', 'b' %} #=> a b a

    Can also specify a group name - see the documentation for more complex examples.

  • for (endfor, else, break, continue) - basic loop.

    For-loop parameters:

    • Limit the iterations using the limit parameter e.g. {% for item in numbers limit:2 %} {{ item }} {% endfor %}

    • Use the offset parameter to start at a particular index.

    • Use the range parameter to create a number range to loop over, range numbers can be variables. e.g. {% for i in (1..100) %} {{ i }} {% endfor %}

    • Use the reversed parameter to reverse the order of the loop

    For-loop variables - in a for-loop, we get the forloop object (ref):

    • forloop.first/last - true when the loop is at the first/last iteration
    • forloop.index/index0 - 1/0-based index number for the current iteration
    • forloop.rindex/rindex0 - 1/0-based reverse index number for the current iteration
    • forloop.length - the length of the array being looped over

  • tablerow (endtablerow) - Generate rows for an HTML table.

    Includes parameters: cols (defines the number of columns), limit, offset, range, first, col, col_first and others. See the documentation for details

Theme/rendering tags

  • comment (endcomment)
  • form
  • include
  • include_relative
  • javascript
  • layout
  • paginate
  • raw (endraw) - temporarily disables tag processing. Useful for generating content (eg, Mustache, Handlebars) which uses conflicting syntax.
  • schema
  • section

  • stylesheet

  • highlight - render a code block with syntax highlighting, optional line numbers. Note that filters are processed inside code blocks so wrap the block with {% raw %} and endraw tags if it contains curly braces. To find the appropriate identifier to use for the language you want to highlight, look for the “short name” on the Rouge wiki or the Pygments’ Lexers page.

  • link - create an html link to another page in the Jekyll site. WARNING: MUST CONTAIN A VALID SOURCE DOCUMENT NAME including folder and source extension otherwise the Jekyll build fails - on GitHub an immensely unhelpful generic error message is produced that does not allow you to identify the document causing the issue.

Variable tags

  • assign - Assign a value to a variable. e.g. {% assign name = 'freestyle' %}
  • capture (endcapture) - Combine a number of outputs and assign to a variable. e.g. {% capture attribute_name %}{{ item.title | handleize }}-{{ i }}-color{% endcapture %}
  • decrement
  • increment