This utility tool can be used to manually run portions of the MSE/EME api for ioslating segment issues. Provide the codecs for the source buffers and append segments as needed. Initialization segments must be appended prior to the segments where they are needed. Portions of the video element can be updated manualy. Buffered source buffer and video ranges will be updated as segments are appended. The page intentionally provides a minimal GUI in order to maximize the number of devices it runs on.