how to add ScriptEditorWebPart to PageLayout
the simple secret is that the ID of the webpart MUST be a guid, example < WebPartPages : ScriptEditorWebPart runat ="server" Content ="<script>alert('hi');</script>" ID ="g_9db1223f_1234_44df_ad5d_e6454520ddfa" > </ WebPartPages : ScriptEditorWebPart >