Create resize-text-in-browsers.md

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docs/contributing/resize-text-in-browsers.md

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+# Resize text in browsers
+
+When building components, you should check that the text:
+
+- resizes with the page and does not stay a fixed size
+- stays within its containers (for example, a box or banner)
+
+If text spills outside of its container, your component:
+
+- will look wrong
+- may not work, if the text blocks out an interactive element
+- may make some text hard for users to read
+
+Follow these instructions to test the effect of resizing text within different browsers and devices. Please note some browsers may work slightly differently, depending on their version.
+
+## Resize text in Firefox
+
+You can resize text in Firefox in 2 ways.
+
+### Use Zoom text only to resize text
+
+1. On the menu bar, select **Firefox**.
+2. Select **Preferences**.
+3. Under **Language and appearance - Zoom**, select **Zoom text only**. This option lets you zoom in or out only on the webpage text. It does not affect images or any other page elements.
+4. Press **Command** (Mac) or **Ctrl** (other operating systems), then **+** or **-** to increase or decrease the text size.
+
+### Use the Size dropdown to resize text
+
+1. On the menu bar, select **Firefox**.
+2. Select **Preferences**.
+3. Under **Language and appearance - Fonts and Colors**, select the **Size** dropdown to display font size options.
+
+## Resize text in Google Chrome
+
+1. On the URL bar, select the 3 dots icon.
+2. Select **Settings**.
+3. Select **Appearance**.
+4. Select **Customise fonts**. The screen displays the options for you to change the font size.
+
+## Resize text in Chrome or Firefox for Android
+
+1. Select **Settings**. 
+2. Select **Accessibility**.
+3. Drag the **Text scaling** slider until you're happy with the size of the example text.
+
+## Resize text in Internet Explorer versions 8 to 11
+
+1. Press **Alt** to display the menu bar. 
+2. On the menu bar, select **View**.
+3. Select **Text size** to display resizing options.
+
+## Resize text in Microsoft Edge
+
+1. On the URL bar, select the 3 dots icon.
+2. Select **Settings**.
+3. Select **Appearance**.
+4. Scroll down to **Fonts** and select the **Font size** dropdown to display font size options.
+
+## Resize text in Safari
+
+1. Press **Option**.
+2. While still pressing **Option**, select the **View** menu.
+3. Select **Make Text Bigger** or **Make Text Smaller**. To display the text in its original size again, select **Actual Size**.
+
+## Known issue: no text resizing in iOS
+
+You cannot resize the text for GOV.UK Design System styles in iOS. 
+
+Due to iOS constraints, our styles do not support adjusting the base font size on iOS devices.
+
+For more details, see our [GitHub issue #882: Investigate Dynamic Type to improve accessibility for iOS users](https://github.com/alphagov/govuk-frontend/issues/882).