Can CSS actually generate accurate inches?

Can you accurately set the width of an element, like a div, in inches and expect it to maintain that width across different devices? Or will it simply scale at a ratio like 1in = 96px?

Edit: Try using CSS to set an element's width in inches and then compare it with a ruler to see the discrepancy.

Edit: In this day and age, do users really need to hold up a ruler to their screens for accurate measurements?

Edit to reopen:

I am developing an application where one element MUST have a specific fixed width in inches across various devices ranging from tablets to desktops (with screen sizes no smaller than 1024 x 768). Some suggestions involve physically measuring and calibrating the area to establish a usable pixel ratio. Is this truly the only solution? Do users really need to use a ruler on the screen?

Edit: Why go through all this trouble, you may ask? I am digitizing a physical product that relies on precise human interaction - scaling the size is not an option, it must remain consistent across all devices.

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Answer №1

Absolutely, it is indeed possible to use measurements like inches, centimeters, and millimeters which are all accepted. The conversion from these length units to pixels is managed by the system. However, the W3C advises against their use on screens as the device must be capable of supporting this conversion.

It's important to note that when using the pixel unit as the anchor, physical units may not perfectly align with their actual physical measurements. Conversely, if a physical unit is used as the anchor, the pixel unit may not correspond to an exact number of device pixels.

The definition of the pixel unit and physical units has evolved over time in CSS specifications. Unlike previous versions, the relationship between the pixel unit and physical units is now fixed to prevent issues with legacy content that relies on the assumption of 96dpi.

(Source: http://www.w3.org/TR/CSS21/syndata.html#length-units)

Answer №2

Utilizing inches in CSS is feasible (specifically 1in) but may not always be precise, due to the need for perfect alignment between the browser, operating system, and monitor. The level of accuracy can vary, with my monitor typically being around half an inch off. For additional insights, you may find my response on this thread helpful. Keep in mind that there is no foolproof method that guarantees 100% accuracy, which is why working with pixels tends to suffice in most cases when dealing with CSS.

Answer №3

Utilizing the 'in' unit can be beneficial, however, the final outcome is contingent on the operating system accurately interpreting the monitor size. Issues may arise due to the pixel density of the screen, making it challenging to determine precise measurements.

To learn more about length units in CSS, refer to this informative link: http://www.w3.org/TR/CSS21/syndata.html#length-units

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