Before this commit The editor used only span with a style tag in order to format text. This was considered to be unclean code. After this commit - use style tag (strong, em, s, u) rather than span with a style tag - use span with style tag if a container is already styled - remove redundant style/tags task-2850566 closes odoo/odoo#99812 Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>