Highlight color
You can export text, drawings, images, and highlight you've added to a PDF file. You can also add texts and drawings programmatically. However, the PDF viewer doesn't support adding highlights programmatically. As for images, that's supported, but using the high-level different API.
Breaking change between pdf.js 3.5 and 3.9: The coordinates of the serialized drawings have changed. Please keep in mind that this is an internal API of pdf.js, so it's subject to change without notice.
<ngx-extended-pdf-viewer
[src]="'/assets/pdfs/blind-text-collection.pdf'"
[textLayer]="true" <!-- enable the find button -->
[showHandToolButton]="true" <!-- enable text selection -->
[height]="'90vh'"> <!-- by default, most CSS frameworks set the height to 0 -->
</ngx-extended-pdf-viewer>