adding a11y question for #172

questions/landmark-roles.md

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+### What are landmark roles and how can they be useful?
+
+#### Answer
+
+Landmark roles is a way to identify different sections of a page like the main content or a navigation region. The Landmarks helps assistive technology users to navigate a page, allowing them skip over areas of it.
+
+For example,
+```html
+<div id="header" role="banner">Header of the Page</div>
+<div id="content" role="main">Main Content Goes Here</div>
+```
+
+#### Good to hear
+
+- Identify sections of a page
+- Assist users in navigating a page
+
+##### Additional links
+
+* [ARIA Landmark Roles](https://www.washington.edu/accessibility/web/landmarks/)
+* [Using ARIA landmarks to identify regions of a page](https://www.w3.org/WAI/GL/wiki/Using_ARIA_landmarks_to_identify_regions_of_a_page)
+
+<!-- tags: (accessibility) -->
+
+<!-- expertise: (1) -->