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           ariadna | 
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           === 4.5 Onwards ===
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           This file has been replaced by UPGRADING.md. See MDL-81125 for further information.
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           ===
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           efrain | 
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           This files describes API changes in /lib/editor/tiny/* - TinyMCE editor,
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           information provided here is intended especially for developers.
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           === 4.2 ===
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           * A list of placeholder selectors was created and can be accessed by placeholderSelectors options. The purpose of this list
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             is to indicate the contents that are only shown in the editor and not to the users, by that way, we can decide to apply or
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             not to apply rules, styles, etc... to these contents.
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             Other Tiny plugins can register their placeholder elements to placeholderSelectors list
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             by calling editor_tiny/options::registerPlaceholderSelectors.
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