`Width: 100% vs. Width: 100vw: What\'s the Real Difference?`

Width:100% vs. Width:100vw: Unveiling the Difference

In an effort to fit an iframe precisely within the confines of the screen's height, one may opt for the seemingly intuitive solution of setting its width to 100%. However, this approach often falls short, necessitating a shift to width:100vh.

Understanding Viewport Units (vw and vh)

The discrepancy between 100% and 100vw stems from the inherent difference in their underlying units. The "%" symbol represents the entire available space within an element, while "vw" and "vh" denote viewport width and height respectively. These units refer specifically to the dimensions of the visible portion of the screen.

Practical Implications

In essence, using width:100vw confines the element to the exact width of the screen, including any document margins. On the other hand, width:100% expands the element to fill every available pixel within its parent container. To ensure that width:100vw behaves identically to width:100%, it is crucial to eliminate any margins from the body element (body { margin: 0 }).

Harnessing vw Units for Responsive Design

The true power of vw units lies in their ability to maintain proportional display across devices of varying resolutions. By assigning font sizes and heights using vw as the unit, your website will adapt seamlessly to different screen widths. This simplifies the task of delivering a consistent user experience on desktop and mobile platforms.

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