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They correspond to the Field Highlight Color and Required Field Highlight Color options in the Accessibility Setup Assistant

It was on July 28, 2017 when PDF 20, known as ISO 32000-2:2017 was published which doesn’t include any non-standardized technologies

PDF File Format Specifications A PDF file is a set of bytes that can be grouped in to tokens according to syntax rules defined by PDF specificationsOnce or more tokens are combined to form higher-level syntactic entities, principally objects, which are the basic data values from which a PDF document is constructedFile Structure of PDF Files PDF file contents are arranged in the following sequence inside the file

|Header |Body |Cross-Reference Table |Trailer PDF File Header Irrespective of the PDF version, a PDF file starts with a header containing unique identifier for PDF and the version of the format such as %PDF-1x where x ranges from 1-7

File Body The body of a PDF file consists of a sequence of indirect objects representing the contents of a document

The objects, as described above, represent components of the document such as fonts, pages and sampled imagesOpen PDFs from last session on Acrobat launch: Reopen PDFs from the last session on launching Acrobat

Open Documents As New Tabs In The Same Window (requires relaunch): Groups multiple documents into tabs when openedYou can also snap or pull out tabs as individual windows

Select a tab and drag the thumbnail that appears away from the toolbar, and then release the tabPrompt Before Closing Multiple Tabs: Confirms from the user before closing Acrobat