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-HTML processing and layout
-The modules in the render directory process and layout HTML pages.
-This is the process to render an HTML document:
-First the HTML is parsed to a tree of xmlNodes using the HTML parser in libxml.
-This happens simultaneously with the fetch [html_process_data()].
-Any stylesheets which the document depends on are fetched and parsed.
-The tree is converted to a 'box tree' by xml_to_box(). The box tree contains a
-node for each block, inline element, table, etc. The aim of this stage is to
-determine the 'display' or 'float' CSS property of each element, and create the
-corresponding node in the box tree. At this stage the style for each element is
-also calculated (from CSS rules and element attributes). The tree is normalised
-so that each node only has children of permitted types (eg. TABLE_CELLs must be
-within TABLE_ROWs) by adding missing boxes.
-The box tree is passed to the layout engine [layout_document()], which finds the
-space required by each element and assigns coordinates to the boxes, based on
-the style of each element and the available width. This includes formatting
-inline elements into lines, laying out tables, and positioning floats. The
-layout engine can be invoked again on a already laid out box tree to reformat it
-to a new width. Coordinates in the box tree are relative to the position of the
-The box tree can then be rendered using each node's coordinates.
-Lists are one or more elements with 'display: list-item' (which is set for 'li'
-by the default CSS). A list-item is constructed as a BLOCK box and a box for the
-marker attached at block->list_marker. The marker contains the bullet, number,
-or similar, depending on the list-style-type.
-Layout of the block is as normal. A pass of layout after main layout places list
-marker boxes to the left of their block (see layout_lists()).
-Absolutely positioned boxes are constructed in the box tree in the same place as
-if they were not absolutely positioned. Inline boxes are created as
-INLINE_BLOCK, tables as TABLE, and other boxes as BLOCK (see
-During layout, absolutely positioned boxes in block context (BLOCK or TABLE) are
-given a position in layout_block_context(), but treated as having no height. In
-inline context (INLINE_BLOCK), they are given a position in layout_line(), but
-treated as having no width or height. This is done to determine the static
-An additional pass after main layout positions and layouts all absolutely
-positioned boxes (see layout_position_absolute()).