This bug is to keep track and summarize my findings about compositing/geometry tests on EFL port. Currently it doesn't apply to EFL/wk1 because accelerated compositing is disabled. Probably GTK port has the same problem, but they do not support AC now. The easiest way problem reproduced on compositing/geometry/composited-in-columns.html tests. Other geometry tests also may fail or flaky. Problem appears when RenderBoxes are positioned during layout. Layout is based on line height + line gap. For SimpleFontDataFreeType line hight is calculated like ascender + descender (FontMetrics.h) . Line gap is calculated like font_extents.height - font_extents.ascent - font_extents.descent (SimpleFontData::platformInit()). When I run this test font_extents.height is less than font_extents.ascent + font_extents.descent and line gap becomes negative (-1) and this affects page layout. font_extents are received from cairo_scaled_font_extents call and internally cairo gets it from freetype font library. Freetype loads LiberationSerif-Regular.ttf font and it seems if this font is loaded 1st it gets wrong metric in face->size->metrics . I tried loading this test into Minibrowser. In this case font is loaded with correct metrics and page layouts correctly. The problem looks very similar to this bug in freetype library: http://savannah.nongnu.org/bugs/?34156 EFL currently uses 2.4.2. I tried upgrading to 2.4.10 and it didn't help.