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d3.select('h1').style('color', 'red')
    .attr('class', 'heading')
    .text('Updated h1 tag');

d3.select('body').append('p').text('First paragraph');
d3.select('body').append('p').text('Second paragraph');
d3.select('body').append('p').text('Third paragraph');

d3.selectAll('p').style('color', 'blue');