<label [ngClass]="{'is-multiple-of-3':multipleOf3}">
<span id="redSquare"></span>
three
<input type="checkbox" name="rememberLogin" id="buttonId" (click)="open()">
</label>
Having text before the input box may not be causing it to not work. The issue could be because in one case, a class is provided to the label element while in the other case, it is provided to the span element. To resolve this, simply use [ngClass] with the label element.
<label [ngClass]="{'is-multiple-of-4':multipleOf4}">
<span id="redSquare4"></span>
<input type="checkbox" id="39" name="DownlinkSource" (click)="downlinkCheckBoxClick()"/>
4
</label>
If you're talking about the redSquare appearing disappearing, then the solution is to move span after the text "three".
<label [ngClass]="{'is-multiple-of-3':multipleOf3}">
three<span id="redSquare"></span>
<input type="checkbox" name="rememberLogin" id="buttonId"
(click)="open()">
</label>
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