tabler/pages/_includes/parts/form/input-icon.html

<div class="mb-3">
	<label class="form-label">Icon input</label>
	{% include "ui/form/input-icon.html" class="mb-3" %}
	{% include "ui/form/input-icon.html" class="mb-3" icon="user" prepend=true placeholder="Username" %}
</div>

<div class="mb-3">
	<label class="form-label">Loader input</label>
	{% include "ui/form/input-icon.html" loader=true class="mb-3" placeholder="Loading…" %}
	{% include "ui/form/input-icon.html" loader=true class="mb-3" icon="user" prepend=true placeholder="Loading…" %}
</div>