HTML JS
(quick guide & examples)
Javascript errors will show in the developer's console by default. Press F12 in most major browsers to bring it up.
TO OUPUT MESSAGES IN THE CONSOLE console.log("MESSAGE"); console.error("MESSAGE");
try { DO SOMETHING } catch (e) { alert(e); }
<div id="err"></div>
try { DO SOMETHING } catch (e) { let err = document.getElementById("err"); err.innerHTML = e; }