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appending span

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Aandrewcowley
Last edited Apr 17, 2018
Created on Apr 17, 2018

This example demonstrates how to append a single text span to a page using D3 v4. The code displays the text "Edit the code below to change me!" as a styled span element, with each click of the "++" button triggering the update function to re-bind the data. The update function uses `div.selectAll('span')` and `.data([txt])` to manage the selection, then calls `spn.enter().append("span")` to add the element if it does not exist. The span is styled with 50-pixel margins and padding via CSS. The visualization uses a simple data array as its input source and relies on D3's data join pattern.

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