yii2-bootstrap5/docs/guide/migrating-yii2-bootstrap.md

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Migrating from yii2-bootstrap4
==============================
yii2-bootstrap5 is a major rewrite of the entire project (according Bootstrap 5 to Bootstrap 4 migration guide).
The most notable changes are summarized below:
## General
* The namespace is `yii\bootstrap5` instead of `yii\bootstrap4`
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* The php compatibility **is limited to** `>=7.0`
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* The close buttons of widgets like [[yii\bootstrap5\Alert|Alert]] or [[yii\bootstrap5|Modal|Modal]] now gets rendered
via CSS and does not have any content anymore. So be sure to remove `btn-close` class and set appropriate styles yourself
if you override it.
## Widgets / Classes
### BaseHtml
### ActiveField
### ActiveForm
There is a new constant [[yii\bootstrap5\ActiveForm::LAYOUT_FLOATING]]. It's a
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[new form layout](https://getbootstrap.com/docs/5.1/forms/floating-labels/) introduced in Bootstrap 5.
### Breadcrumbs
### ButtonDropdown
### ButtonToolbar
### Carousel
### LinkPager
### Modal
### Nav
### NavBar
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There is now the possibility to create an [offcanvas navbar](https://getbootstrap.com/docs/5.1/components/navbar/#offcanvas).
You can achieve this by setting the `$collapseOptions` to `false` in [[yii\bootstrap5\NavBar|Navbar]] widget and the
`$offcanvasOptions` to at least an empty array.
### Tabs
### ToggleButtonGroup