var counter = 0;

function myCounter() {
    counter++;
    document.getElementById("counterDisplay").innerText=counter;
    console.log("vous avez cliqué!" , counter, " fois");
}

document.getElementById("clickCounter").addEventListener("click" , myCounter)

function changeFontSize() {
    var newSize = document.getElementById('textSize').value + "px";
    var paragraphs= document.getElementsByTagName('p');

    for(var i=0; i< paragraphs.length; i++) {
        paragraphs[i].style.fontSize = newSize;
    }
} 

document.getElementById("textSize").addEventListener("input" , changeFontSize)