If you are looking for Online Syllabus for CBSE, then yes, it is available. Not only for CBSE but for TN board and Karnataka board, it is available. Please use the following links:
Karnataka book only have 10th books now. But soon other class books will come. This will be helpful for kids who avail the book in different format. Like Visually Impaired kids need book in braille and conversion in braille from here is very easy.