Window Management

Control browser window size and position for responsive testing.

Concept

Testing responsive layouts requires controlling the browser window size. Selenium lets you programmatically set dimensions and position to simulate different devices or screen resolutions.

Test mobile, tablet, and desktop views in the same session.
Ensure UI elements adapt correctly to different screen sizes.
Position windows for multi-monitor setups or screenshots.

Window Sizing

maximize(): Fills available screen space.
setSize(width, height): Sets exact dimensions.
getSize(): Returns current window dimensions.

Window Positioning

setPosition(x, y): Moves window to coordinates.
getPosition(): Returns current position.
Useful for multi-monitor test setups.

Common Dimensions

Mobile: 375x667 (iPhone SE) • Tablet: 768x1024 (iPad) • Desktop: 1920x1080 (Full HD)

Interactive Practice

Live Window Dimensions

Current Browser Size

0×0

Resize your browser window to see values update!

Selenium can set these dimensions programmatically for responsive testing.

Java Code Example

WindowResizer.java

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// Maximize the window
driver.manage().window().maximize();

// Set to a specific size (e.g., Tablet)
driver.manage().window().setSize(new Dimension(768, 1024));

// Move window to top-left corner
driver.manage().window().setPosition(new Point(0, 0));

// Set to Mobile size
driver.manage().window().setSize(new Dimension(375, 667));

driver.quit();

Code Breakdown

driver.manage().window().maximize(): Maximizes the browser window to fill the available screen space. Common at start of tests.
new Dimension(768, 1024): Creates a dimension object with width 768 and height 1024.
driver.manage().window().setPosition(...): Moves the browser window to specific screen coordinates.

Pro Tip

Consistent Screenshots

Always set a fixed window size before taking screenshots to ensure they are consistent across different test runs and machines.

Helper Methods

Create reusable helper methods like setMobileView() or setDesktopView() to simplify viewport changes in your tests.

Headless Mode

Window positioning commands may not work in headless mode. Focus on sizing for CI/CD environments.