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The CSS Propertie top
The top property is an inward inset from the top side of a positioned box. Interpretation varies by position: for absolute it insets from the containing block; for relative, from the original margin edge; for sticky, from the scrollport edge. Percentages refer to the containing block height.
.box {
top: 20px;
}
.overlay {
position: fixed;
top: 0;
left: 0;
}
min:-9999
max:9999
step:1
units:px | % | em | rem | vh | vw
autoThe default value. An unconstrained inset; meaning depends on the positioning scheme (typically 0 for absolute when no other side specified).
CSS Positioned Layout Module Level 3
Editor's Draft
<length-percentage>
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