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Spotify Lyrics. Let bytes be the result of processing blob parts given blobParts and options. If the type member of the options argument is not the empty string, run the following sub-steps:. Let t be the type dictionary member. Return a Blob object referring to bytes as its associated byte sequence, with its size set to the length of bytes , and its type set to the value of t from the substeps above. The Blob constructor can be invoked with the parameters below:.
BufferSource elements. Blob elements. USVString elements. By default this is set to "transparent". If set to "native" , line endings will be converted to native in any USVString elements in blobParts.
If element is a USVString , run the following substeps:. If the endings member of options is "native" , set s to the result of converting line endings to native of element. Append the result of UTF-8 encoding s to bytes.
Scenarios exist when the Blob constructor may result in some data loss due to lost or scrambled character sequences. If element is a BufferSource , get a copy of the bytes held by the buffer source , and append those bytes to bytes. If element is a Blob , append the bytes it represents to bytes. Note: The type of the Blob array element is ignored and will not affect type of returned Blob object. Set result to the empty string. Let position be a position variable for s , initially pointing at the start of s.
User agents can also determine the type of a Blob , especially if the byte sequence is from an on-disk file; in this case, further normative conditions are in the file type guidelines. Note: Use of the type attribute informs the package data algorithm and determines the Content-Type header when fetching blob URLs. The slice method returns a new Blob object with bytes ranging from the optional start parameter up to but not including the optional end parameter, and with a type attribute that is the value of the optional contentType parameter.
It must act as follows:. The optional start parameter is a value for the start point of a slice call, and must be treated as a byte-order position, with the zeroth position representing the first byte. User agents must process slice with start normalized according to the following:. The optional end parameter is a value for the end point of a slice call. User agents must process slice with end normalized according to the following:. User agents must process the slice with contentType normalized according to the following:.
Return a new Blob object S with the following characteristics:. The stream method, when invoked, must return the result of calling get stream on this. The text method, when invoked, must run these steps:. Let stream be the result of calling get stream on this. Let reader be the result of getting a reader from stream. If that threw an exception, return a new promise rejected with that exception. Let promise be the result of reading all bytes from stream with reader.
Return the result of transforming promise by a fulfillment handler that returns the result of running UTF-8 decode on its first argument. The arrayBuffer method, when invoked, must run these steps:. Return the result of transforming promise by a fulfillment handler that returns a new ArrayBuffer whose contents are its first argument.
A File object is a Blob object with a name attribute, which is a string; it can be created within the web application via a constructor, or is a reference to a byte sequence from a file from the underlying OS file system. If a File object is a reference to a byte sequence originating from a file on disk, then its snapshot state should be set to the state of the file on disk at the time the File object is created.
Note: This is a non-trivial requirement to implement for user agents, and is thus not a must but a should [RFC]. If the file is modified on disk following the time a reference has been taken, the File 's snapshot state will differ from the state of the underlying storage. User agents may use modification time stamps and other mechanisms to maintain snapshot state , but this is left as an implementation detail.
When a File object refers to a file on disk, user agents must return the type of that file, and must follow the file type guidelines below:. User agents must return the type as an ASCII-encoded string in lower case, such that when it is converted to a corresponding byte sequence, it is a parsable MIME type , or the empty string — 0 bytes — if the type cannot be determined. File objects are serializable objects.
Their deserialization steps , given value and serialized , are:. Let bytes be the result of processing blob parts given fileBits and options. Let n be the fileName argument to the constructor. Note: Underlying OS filesystems use differing conventions for file name; with constructed files, mandating UTF lessens ambiquity when file names are converted to byte sequences.
Process FilePropertyBag dictionary argument by running the following substeps:. If the type member is provided and is not the empty string, let t be set to the type dictionary member. If the lastModified member is provided, let d be set to the lastModified dictionary member.
If it is not provided, set d to the current date and time represented as the number of milliseconds since the Unix Epoch which is the equivalent of Date. Return a new File object F such that:. F refers to the bytes byte sequence. The File constructor can be invoked with the parameters below:. Blob elements, which includes File elements. The File interface, which inherits from Blob , is immutable, and thus represents file data that can be read into memory at the time a read operation is initiated.
User agents must process reads on files that no longer exist at the time of read as errors , throwing a NotFoundError exception if using a FileReaderSync on a Web Worker [Workers] or firing an error event with the error attribute returning a NotFoundError.
It's also used for a list of files dropped into web content when using the drag and drop API; see the DataTransfer object for details on this usage. In particular, this means syntax of the sort filelist.
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