# renderer/core/paint The code in this directory converts the LayoutObject tree into an efficient rendering format for the compositor (a list of cc::Layers containing display item lists, and associated cc::PropertyTrees). For a high level overview, see the [Overview](#Overview) section. For information about how the display list and paint property trees are implemented, see [the platform paint README file](../../platform/graphics/paint/README.md). This code is owned by the [rendering team](https://www.chromium.org/teams/rendering). [TOC] ## Glossaries ### Stacked elements and stacking contexts This chapter is basically a clarification of [CSS 2.1 appendix E. Elaborate description of Stacking Contexts](http://www.w3.org/TR/CSS21/zindex.html). Note: we use 'element' instead of 'object' in this chapter to keep consistency with the spec. We use 'object' in other places in this document. According to the documentation, we can have the following types of elements that are treated in different ways during painting: * Stacked objects: objects that are z-ordered in stacking contexts, including: * Stacking contexts: elements with non-auto z-indices or other properties that affect stacking e.g. transform, opacity, blend-mode. * Replaced normal-flow stacking elements: [replaced elements](https://html.spec.whatwg.org/C/#replaced-elements) that do not have non-auto z-index but are stacking contexts for elements below them. Examples include SVG `` and HTML `