twbs--bootstrap/docs/components/buttons.md

Buttons

Use any of the available button classes to quickly create a styled button.

{% example html %}

Primary

Secondary

Success

Warning

Danger

Link {% endexample %}

Sizes

Fancy larger or smaller buttons? Add .btn-lg, .btn-sm, or .btn-xs for additional sizes.

{% example html %} Large button Large button {% endexample %}

{% example html %} Small button Small button {% endexample %}

{% example html %} Extra small button Extra small button {% endexample %}

Create block level buttons—those that span the full width of a parent—by adding .btn-block.

{% example html %} Block level button Block level button {% endexample %}

Active state

Buttons will appear pressed (with a darker background, darker border, and inset shadow) when active. There's no need to add a class to <button>s as they use a pseudo-class. However, you can still force the same active appearance with .active should you need to replicate the state programmatically.

{% example html %} Primary link Link {% endexample %}

Disabled state

Make buttons look unclickable by adding the disabled boolean attribute to any <button> element.

{% example html %} Primary button Button {% endexample %}

As <a> elements don't support the disabled attribute, you must add the .disabled class to fake it.

{% example html %} Primary link Link {% endexample %}

Cross-browser compatibility

If you add the disabled attribute to a <button>, Internet Explorer 9 and below will render text gray with a nasty text-shadow that we cannot fix.

Link functionality caveat

This class uses pointer-events: none to try to disable the link functionality of <a>s, but that CSS property is not yet standardized and isn't fully supported in Opera 18 and below, or in Internet Explorer 11. So to be safe, use custom JavaScript to disable such links.

Context-specific usage

While button classes can be used on <a> and <button> elements, only <button> elements are supported within our nav and navbar components.

Button tags

Use the button classes on an <a>, <button>, or <input> element.

{% example html %} Link Button {% endexample %}

Cross-browser rendering

As a best practice, we highly recommend using the <button> element whenever possible to ensure matching cross-browser rendering.

Among other things, there's a bug in Firefox <30 that prevents us from setting the line-height of <input>-based buttons, causing them to not exactly match the height of other buttons on Firefox.