142をちょっと修正。
http://www.velvet-number.com/p5_test/test103/
var text_div01; var targetx; var targety; var txtposx = 0; var txtposy = 0; function preload () { } function setup () { pixelDensity (displayDensity ()); createCanvas (windowWidth, windowHeight); colorMode (RGB, 256); background (255); text_div01 = createDiv ('p5.jsでdiv要素を作ってCSSを設定'); text_div01.style ('font-family', 'sans-serif'); text_div01.style ('font-size', '24px'); text_div01.style ('font-weight', '700'); text_div01.style ('color', '#000000'); text_div01.style ('text-align', 'center'); } function draw () { targetx = mouseX / 10; targety = mouseY; txtposx += (targetx - txtposx) * 0.1; txtposy += (targety - txtposy) * 0.1; text_div01.position (txtposx, txtposy); text_div01.style ('font-size', txtposx + 'px'); }