Discussion
In CSS, what does the 'z-index' property control?
Answer: B
z-index controls the stacking order of elements.
Where positioned elements (position relative, absolute, fixed or sticky) overlap, z-index decides which appears in front. A higher value is stacked above a lower one within the same stacking context, which is how modals and drop-down menus are kept on top.
Font size is set by font-size and transparency by opacity. Zoom level is a browser setting, or the scale transform, not z-index.
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