json-if

A <template> element with json-if attribute can be used to conditionally include content, and json-else can optionally be used to cover the opposite condition.

<template json-if="someCondition">
  <span>This is only shown if `someCondition` is truthy.</span>
</template>
<template json-else>
  <span>This is only show if the condition is falsy</span>
</template>

json-else

A <template> element with json-else can optionally directly follow the json-if template. The attribute must be empty.