center is not known element:html tag center not recognized angular 4

Question

center tag is not working saying center is not known element

<center>
    <a><img class="placeholder_img" src="img/placeholder.png"></a>
</center>

I used the above html tag saying that "center is not known element".

Answer 1

The <center> tag expired and deprecated long back.

Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

Use <div> instead:

<div style="text-align: center;">
  <a><img class="placeholder_img" src="//placehold.it/100"></a>
</div>