The most basic logic check is a simple if/else. This allows you to put HTML if a condition matches, or something else if it doesn't.
The syntax is simply:
{{if [expression]}}
HTML to output if expression is true
{{else}}
HTML to output if expression was not true
{{endif}}
There's also an elseif tag which allows you to specify other conditions to check if earlier conditions didn't match.
{{if [expression]}}
HTML to output if expression is true
{{elseif [expression]}}
HTML to output if expression is true
{{else}}
HTML to output if other expressions were not true
{{endif}}
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