Which specific browser feature or utility allows web developers to test mobile responsive web configurations by mimicking different smartphone screen aspect ratios natively within the desktop display window?
A. Local server cache monitoring index
B. Device Mode / Responsive Design View
C. Standard bookmark navigation manager
D. Incognito browser window frame
Answer: Option B
Solution (By JKExamLibrary)
Responsive Design View inside browser DevTools lets developers simulate various device viewports, touch interactions, and network throttling states directly on their desktop monitors.
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