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+Angular Material's stepper provides a wizard-like workflow by dividing content into logical steps.
+
+Material stepper builds on the foundation of the CDK stepper that is responsible for the logic
+that drives a stepped workflow. Material stepper extends the CDK stepper and has Material Design
+styling.
+
+### Stepper variants
+There are two stepper components: `md-horizontal-stepper` and `md-vertical-stepper`. They 
+can be used the same way. The only difference is the orientation of stepper. 
+`md-horizontal-stepper` selector can be used to create a horizontal stepper, and
+`md-vertical-stepper` can be used to create a vertical stepper. `md-step` components need to be
+placed inside either one of the two stepper components.
+
+### Labels
+If a step's label is only text, then the `label` attribute can be used.
+```html
+<md-vertical-stepper>
+  <md-step label="Step 1">
+    Content 1
+  </md-step>
+  <md-step label="Step 1">
+    Content 2
+  </md-step>
+</md-vertical-stepper>
+```
+
+For more complex labels, add a template with the `mdStepLabel` directive inside the 
+`md-step`.
+```html
+<md-vertical-stepper>
+  <md-step>
+    <ng-template mdStepLabel>...</ng-template>
+    ...
+  </md-step>
+</md-vertical-stepper>
+```
+
+### Stepper buttons
+There are two button directives to support navigation between different steps:
+`mdStepperPrevious` and `mdStepperNext`.
+```html
+<md-horizontal-stepper>
+  <md-step>
+    ...
+    <div>
+      <button md-button mdStepperPrevious>Back</button>
+      <button md-button mdStepperNext>Next</button>
+    </div>
+  </md-step>
+</md-horizontal-stepper>  
+```
+
+### Linear stepper
+The `linear` attribute can be set on `md-horizontal-stepper` and `md-vertical-stepper` to create
+a linear stepper that requires the user to complete previous steps before proceeding
+to following steps. For each `md-step`, the `stepControl` attribute can be set to the top level
+`AbstractControl` that is used to check the validity of the step. 
+
+There are two possible approaches. One is using a single form for stepper, and the other is
+using a different form for each step.
+
+#### Using a single form
+When using a single form for the stepper, `mdStepperPrevious` and `mdStepperNext` have to be
+set to `type="button"` in order to prevent submission of the form before all steps
+are completed. 
+
+```html
+<form [formGroup]="formGroup">
+  <md-horizontal-stepper formArrayName="formArray" linear>
+    <md-step formGroupName="0" [stepControl]="formArray.get([0])">
+      ...
+      <div>
+        <button md-button mdStepperNext type="button">Next</button>
+      </div>
+    </md-step>
+    <md-step formGroupName="1" [stepControl]="formArray.get([1])">
+      ...
+      <div>
+        <button md-button mdStepperPrevious type="button">Back</button>
+        <button md-button mdStepperNext type="button">Next</button>
+      </div>
+    </md-step>
+    ...
+  </md-horizontal-stepper> 
+</form>
+```
+
+#### Using a different form for each step
+```html
+<md-vertical-stepper linear>
+  <md-step [stepControl]="formGroup1">
+    <form [formGroup]="formGroup1">
+      ...
+    </form>
+  </md-step>
+  <md-step [stepControl]="formGroup2">
+    <form [formGroup]="formGroup2">
+      ...
+    </form>
+  </md-step>
+</md-vertical-stepper>
+```
+### Types of steps
+
+#### Optional step
+If completion of a step in linear stepper is not required, then the `optional` attribute can be set
+on `md-step`. 
+
+#### Editable step
+By default, steps are editable, which means users can return to previously completed steps and
+edit their responses. `editable="true"` can be set on `md-step` to change the default. 
+
+#### Completed step
+By default, the `completed` attribute of a step returns `true` if the step is valid (in case of
+linear stepper) and the user has interacted with the step. The user, however, can also override
+this default `completed` behavior by setting the `completed` attribute as needed.
+
+### Keyboard interaction
+- <kbd>LEFT_ARROW</kbd>: Focuses the previous step header
+- <kbd>RIGHT_ARROW</kbd>: Focuses the next step header
+- <kbd>ENTER</kbd>, <kbd>SPACE</kbd>: Selects the step that the focus is currently on
+- <kbd>TAB</kbd>: Focuses the next tabbable element
+- <kbd>TAB</kbd>+<kbd>SHIFT</kbd>: Focuses the previous tabbable element
+
+### Accessibility
+The stepper is treated as a tabbed view for accessibility purposes, so it is given
+`role="tablist"` by default. The header of step that can be clicked to select the step
+is given `role="tab"`, and the content that can be expanded upon selection is given
+`role="tabpanel"`. `aria-selected` attribute of step header and `aria-expanded` attribute of
+step content is automatically set based on step selection change.
+
+The stepper and each step should be given a meaningful label via `aria-label` or `aria-labelledby`.
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