Can someone explain the reason behind the sizing discrepancies of HTML and body elements when emulating a mobile device in Chrome Developer Tools?

Recently, I attempted to load a tool on my phone that I have been developing for internal use at my workplace.

Upon loading the tool, I noticed some discrepancies in the display, which I had anticipated. However, one specific element seemed particularly unusual.

To investigate further, I accessed the page using Chrome on a MacBook Pro and utilized the "Device Toolbar" feature to simulate the display on a mobile device in my desktop browser. For privacy reasons, I will demonstrate using Google.com. Here is what I observed:

https://i.sstatic.net/wSj1r.png

The highlighted element is the body, with the html element showing similar behavior.

This anomaly is also present in my application, which explains the issue when accessing it on my phone.

Despite my efforts, I am unable to comprehend why these elements are displaying at this size. There are no explicit width constraints or maximum widths specified in the code that should cause this unusual behavior.

Is there anyone who can provide insight into this behavior?

UPDATE

Upon further investigation, it seems that there is some abnormal behavior occurring within the Dev Tools. While utilizing this method for mobile testing may not be ideal (I'm open to changing my perspective on this, Google...), the fact remains that at times, the body element fails to adjust its size to accommodate its content.

htmlcssgoogle-chromemobile

Answer №1

Typically, block-level elements like <body> do not automatically adjust to fit their content. Instead, they will expand to the width of their container. For more detailed information, refer to the specification.

You can observe this behavior in this code snippet. When you resize the browser window, you will notice that the body width changes based on the viewport size, while the content width remains unaffected.

For further insights, check out this discussion on Stack Overflow: Why doesn't the <body> expand to accommodate its contents?

Additionally, be cautious about relying too heavily on the Chrome DevTools device toolbar. Adjusting the zoom, toggling the toolbar on and off, and modifying its settings can sometimes lead to inaccuracies and unreliable behavior. I've encountered situations where the device toolbar misled me, causing wasted time trying to troubleshoot non-existent issues.

https://i.sstatic.net/qZSNg.png

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