руководства по верстке
const input = document.querySelector(".placeholder");
input.addEventListener("keydown", (e) => {
const condition = e.target.value.length < 5 ? "new" : "password";
input.placeholder = condition;
})
<input class="placeholder" placeholder="password">
const input = document.querySelector(".placeholder");
const output = document.querySelector(".for-error");
input.addEventListener("input", (e) => {
const condition = e.target.value.length < 5 ? "the password is too short" : "";
output.textContent = condition;
})
<input class="placeholder" placeholder="password">
<span class="for-error"></span>
select {
color: green;
}
//
.personal_form-select_choise {
color: green;
}
select option[value="1"] {
color: green
}
//
.personal_form-select_choise option[value="1"] {
color: green
}
<option value="1">новый предмет</option>