Fill color. Value must be a CSS-style, six-digit hex color string (like '#fa0404').

Determines the first "letter" of text to highlight. Value is a zero-based index into the UTF-16 code units for the text of the page where the highlight begins (specified by pageNumber) determining the first grapheme ("letter") to include in the highlight. Value must be an integer greater than or equal to 0. If the value falls in the middle of a grapheme that is made up of multiple UTF-16 code units, the highlight will automatically expand to include the entire grapheme.

One-indexed page number where the highlight annotation ends. Must be an integer greater than or equal to pageNumber.

Determines the last "letter" of text to highlight. Value is a zero-based index into the UTF-16 code units for the text of the page where the highlight ends (specified by lastPageNumber) determining the last grapheme ("letter") to include in the highlight. Value must be an integer greater than or equal to 0. If the value falls in the middle of a grapheme that is made up of multiple UTF-16 code units, the highlight will automatically expand to include the entire grapheme. Note that this end index is inclusive: the grapheme indicated by the value will be included in the highlight.

Internal metadata about how to render a text highlight. When this property is present, you should not modify or remove it. Calls to PdfViewerControl.getAnnotations will include this property so that, if you persist the annotations and then reload them in a future version of our viewer, we can ensure the text highlight is positioned correctly.