This example demonstrates how to select and update DOM elements using D3.js selectors within a minimal HTML page. It shows three heading elements—`h3` tags, an element with an `id` of `h4`, an element with a `title` attribute of `author`, and a `h3` with a `class` of `date`—each receiving distinct text content. The code uses `d3.select` and `d3.selectAll` to target elements by tag, ID, attribute, and class, then sets their text with `.text()`. The data source is the hardcoded string values within the script, not the accompanying CSV file.