css - Make text present in PDF document, but invisible -


how can have text in html document “there” in pdf document (generated via wkhtmltopdf), invisible when viewed or printed?

constraints:

  • the text must appear @ right place, right size, because purpose find text automated tool , discover co-ordinates , size on page.

  • the solution must text only, because i'm trying keep css styles. “hide under element” doesn't address problem, because there might not other element @ co-ordinates.

  • the solution can't dependent on what's on page; can't go inspecting background elements on page because can't determine dynamically. text should invisible in own right.

  • the text must findable automated tool (e.g. pdfgrep), means wkhtmltopdf must place text in document file.

    so “display: none” style or “opacity: 0” doesn't work, because makes text not exist @ in pdf document.

so want have html document, place text element “foo” within document inline css style, , process through wkhtmltopdf; then, pdfgrep foo should find text, text location , size should correct, text should not show in html, not appear when pdf viewed, , not appear when it's printed.

with style of color: transparent; text transparent on page, show tool looking in document text.


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