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  * Copyright 2012 Google Inc.
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  * use this file except in compliance with the License. You may obtain a copy of
  * the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
package elemental.html;
import  elemental.html.*;

This is an experimental feature
Because this feature is still in development in some browsers, check the compatibility table for the proper prefixes to use in various browsers.

A Blob object represents a file-like object of immutable, raw data. Blobs represent data that isn't necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user's system.

An easy way to construct a Blob is by using the BlobBuilder interface, which lets you iteratively append data to a blob, then retrieve the completed blob when you're ready to use it for something. Another way is to use the slice() method to create a blob that contains a subset of another blob's data.

Note: The slice() method has vendor prefixes: blob.mozSlice() for Firefox and blob.webkitSlice() for Chrome. An old version of the slice() method, without vendor prefixes, had different semantics, as described below.
public interface Blob {

The size, in bytes, of the data contained in the Blob object. Read only.
  double getSize();

An ASCII-encoded string, in all lower case, indicating the MIME type of the data contained in the Blob. If the type is unknown, this string is empty. Read only.
  Blob webkitSlice(double start);
  Blob webkitSlice(double startdouble end);
  Blob webkitSlice(double startdouble endString contentType);
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