why my console does not recognize the getElementByClassName and getElementByTagName and querySelectorAll methods while it know getElementById and querySelector?and I can not change the style with querySelector
why can't i change my html content by queryselectorall and getelementbyclass name?
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mydoc=document.getElementsByClassName("forth");returns a HTMLCollection object. HTMLCollection does not have a innerHTML property. You need to access a specific element of the collection through it's index. I.e.mydoc[0].innerHTML = "change me please";ormydoc = document.getElementsByClassName("forth")[0];