Dropdowns

Single Dropdown
Any single .btncan be turned into a dropdown toggle with some markup changes. Here’s how you can put them to work with either <button>elements:
Split Dropdown
Similarly, create split button dropdowns with virtually the same markup as single button dropdowns, but with the addition of .dropdown-toggle-splitfor proper spacing around the dropdown caret.
Sizing Dropdown
Button dropdowns work with buttons of all sizes, including default and split dropdown buttons.
Menu Alignment Left
By default, a dropdown menu is automatically positioned 100% from the top and along the left side of its parent.
Menu Alignment Right
By default, a dropdown menu is automatically positioned 100% from the top and along the left side of its parent. Add .dropdown-menu-rightto a .dropdown-menuto right align the dropdown menu.
Dropdown
Trigger dropdown menus below elements by default to the parent element.
Dropup
Trigger dropdown menus above elements by adding .dropupto the parent element.
Dropright
Trigger dropdown menus at the right of the elements by adding .droprightto the parent element.
Dropleft
Trigger dropdown menus at the left of the elements by adding .dropleftto the parent element.

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