test-repo/tests/format/angular/control-flow/content.html

<FancyButton [label]="title">
    @content(icon) {
      <span>Icon!</span>
    }
      @content(description) {
        <span>Description text</span>
      }
  <span>Other children</span>
   </FancyButton>

<FancyButton [label]="title">
      @content (items; let item, index) {
        <span>#{{index}}: {{item}}</span>
      }
    </FancyButton>

<FancyList>
            @content (renderHeader; let _) {
              <span>Header Content</span>
            }
          </FancyList>

<FancyTable>
            @content (renderRow; let row, idx, isLast) {
              <span>{{ idx }} - {{ row }} (Last: {{ isLast }})</span>
            }
          </FancyTable>

<DynamicIf [injector]="injector" [cond]="visible">
            @content (children; let result) {
              <child>{{ result }}</child>
            }
          </DynamicIf>