Opacity is a style property used to show or hide the html element.
For example 0 for hide and 1 for show.
<p style="opacity: 0">Show Me</p> //will not show on the page
<p style="opacity: 0.5">Show Me</p>
<p style="opacity: 1">Show Me</p>
The Opacity declaration sets how opaque an element is.An opacity value of 1 means the element is fully opaque.An
opacity value of 0 means an element is not at all opaque, i.e. fully transparent.This elements opacity is 0.5!
Note that both the text and the background-color are affected by the opacity level.
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