HTML

angular if

<div *ngIf="condition">Content to render when condition is true.</div>

Angular If else

<div *ngIf="isValid;else other_content">
    content here ...
</div>

<ng-template #other_content>other content here...</ng-template>

<div *ngIf="isValid;then content else other_content">here is ignored</div>
<ng-template #content>content here...</ng-template>
<ng-template #other_content>other content here...</ng-template>

<div *ngIf="isValid;then content"></div>
<ng-template #content>content here...</ng-template>

angular js if

<span>{{isLarge ? 'video.large' : 'video.small'}}</span>

angular if else

<div *ngIf="condition; else elseBlock">
	Content to render when condition is true.
</div>
<ng-template #elseBlock>
	Content to render when condition is false.
</ng-template>