Render tests are .htm files in litehtml/test directory.
Tests starting with "-" are disabled.
Correct rendering is in corresponding .htm.png file.
To generate .png file, run ctest from litehtml/build. The test will fail
and create xxx.htm-FAILED.png file. Rename it to xxx.htm.png
One ASCII raster font with 3 sizes is supported, see litehtml/containers/test/fonts. This should be enough for tests.
Border painting is supported, only solid borders.
Backgrounds, images and list markers are not supported.
