How come my responsive design functions properly when I test it using the mobile device tool, but fails to work when I manually decrease the browser size?

While testing my responsive design, I've noticed that using the toggle device tool in the Inspect tools of my browser produces the expected results. However, when I simply resize the browser window manually, the design does not respond as it should. Could this be a bug?

My implementation involves JavaScript to detect the screen size with the following function:

if(window.screen.availWidth > 1024 && window.screen.availWidth < 1200) { 
 ...
} else if(window.screen.availWidth > 1200) { 

... 

}

I've observed that the first condition 

window.screen.availWidth > 1024 && window.screen.availWidth < 1200
is not satisfied when resizing the browser window, but works correctly when using the mobile tool in the inspect tools.

The specific mobile tool I am referring to can be seen here: https://i.sstatic.net/5FHOe.png

Could this discrepancy be a bug, or perhaps an issue related to the availWidth property?

javascripthtmlcssresponsive-design

Answer №1

window.screen.availWidth provides the device screen width, not the browser window width. When using the mobile tool, the browser mimics a mobile device, causing the webpage to consider the screen as mobile-sized regardless of the browser dimensions. On the other hand, window.screen.availWidth captures the monitor screen width and does not account for the browser window size.

You may find the window.innerWidth property more suitable in this scenario.

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