Why is 15pt and 15px the same in Photoshop but not in Dreamweaver?

Hello,
I'm building web comps in Photoshop and then developing a matching style guide for developers. As I gather my font size information I've noticed (for example) 15px and 15pt type in Photoshop is visually the same size but is not visually the same size in Dreamweaver (note: Photoshop px to Dreamweaver px is the same but Photoshop pt to Dreamweaver pt is not). Do you know why this is the case? Any suggestions on translating font size in Photoshop to a font size developers can use (ie. CSS or HTML)?
Thanks in advance :-)

FWIW -
From:
Java 2D Graphics by Jonathan Knudsen
True typographic points are .01383 inches, which is slightly less than 1/72 inch.
From Wikipedia:
In typography, a point is the smallest unit of measure, being a subdivision of the larger pica. It is commonly abbreviated as pt. The traditional printer's point, from the era of hot metal typesetting and presswork, varied between 0.18 and 0.4 mm depending on various definitions of the foot.
Today, the traditional point has been supplanted by the desktop publishing point (also called the PostScript point), which has been rounded to an even 72 points to the inch (1 point = 127⁄360 mm = 352.7 µm). In either system, there are 12 points to the pica.
A pixel is whatever you define it to be.
Craig

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Why is 15pt and 15px the same in Photoshop but not in Dreamweaver?

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