Markup: templates/output/04-elements/forms/button/button-icon-left.html
<!-- START BUTTON WITH ICON LEFT-->
<button class="btn btn--icon-left" title="This is a default title text">
<svg viewBox="0 0 36 36.111" role="img" aria-hidden="true" focusable="false">
<use xlink:href="Images/svg/sprite.symbol.svg#icon-idea"></use>
</svg><span>Button text</span>
</button>
<!-- END BUTTON WITH ICON LEFT-->
<!-- START DISABLED BUTTON WITH ICON LEFT-->
<button class="btn btn--icon-left" disabled="disabled">
<svg viewBox="0 0 36 36.111" role="img" aria-hidden="true" focusable="false">
<use xlink:href="Images/svg/sprite.symbol.svg#icon-idea"></use>
</svg><span>Disabled button text</span>
</button>
<!-- END DISABLED BUTTON WITH ICON LEFT-->
Source:
assets/sass/04-elements/_elements.forms.scss
, line 902