css stacking context
in CSS/HTML, A stacking context is a 3D conceptualisation of an element. This can be a root stacking context, as created by the html element. Or it can be a local stacking context, as created by specific properties and values. Rules: What creates a stacking context - https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Positioning/Understanding_z_index/The_stacking_context#the_stacking_context Rules: Paint order of the stack's inner elements: - Elements with a negative stack level, typically elements with z-index: -1 - Elements with a position value of static. - Elements with a stack level of 0, typically positioned elements with a z-index value of auto. - Elements with positive stack levels, e.g. a positioned element with a z-index value of 1 or higher. - Two elements with the same stack level are layered based on their source order. Successive elements stack on top of their predecessors.
