Here is a Youtube Link for 2021 IRC requirements for deck guard attachment: 2021 IRC
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Good video.
Everyone, regardless of knowledge level, should make the time to watch it.
Thanks for sharing.
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Very good video. Worth watching.
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Yes another great video from JLC, I’ve been subscribed to their weekly newsletter for years.
If you’re interested you can get it here… or click on the link above the video.
https://zonda.dragonforms.com/loading.do?pk=headerpromo&omedasite=JLCGroup_Reg
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Nice, thanks for sharing.
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Great way to look at it…thanks. 
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Here’s the handout for this section if you’d like something to read as the video moves along. All new stuff, just copy and print. Good video!
R507.10 Exterior guards. Guards shall be constructed to
meet the requirements of Sections R301.5 and R312, and this
section.
R507.10.1 Support of guards. Where guards are
supported on deck framing, guard loads shall be transferred
to the deck framing with a continuous load path to
the deck joists.
R507.10.1.1 Guards supported by side of deck
framing. Where guards are connected to the interior
or exterior side of a deck joist or beam, the joist or
beam shall be connected to the adjacent joists to
prevent rotation of the joist or beam. Connections relying
only on fasteners in end grain withdrawal are not
permitted.
R507.10.1.2 Guards supported on top of deck framing.
Where guards are mounted on top of the decking,
the guards shall be connected to the deck framing or
blocking and installed in accordance with manufacturer’s
instructions to transfer the guard loads to the
adjacent joists.
R507.10.2 Wood posts at deck guards. Where 4-inch by
4-inch (102 mm by 102 mm) wood posts support guard
loads applied to the top of the guard, such posts shall not
be notched at the connection to the supporting structure.
R507.10.3 Plastic composite guards. Plastic composite
guards shall comply with the provisions of Section
R507.2.2.
R507.10.4 Other guards. Other guards shall be in accordance
with either manufacturer’s instructions or accepted
engineering principles.
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You’re The Best!
For fun I asked CoPilot to make an illustration for deck guardrail attachment.
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Great video, thanks for sharing.
For fun… I would love to see the underside of that over engineered Steampunk contraption! 
Good information.