Inspect webkit-input-placeholder with developer tools

I figured it out.

The trick is to enable ‘Show user agent shadow DOM’ in the Settings panel of Chrome Developer Tools:

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To get to settings, click the Gear icon at the top right of your Dev Tools panel, then make sure Preferences tab on the left-hand side is selected, find the Elements heading, and check “Show user agent shadow DOM” checkbox below that heading.

With that, you can now see it:

enter image description here

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