I now found an answer: It just works when I add display: none !important;. I dont know, what exactly is blocking the display: none; but if someone else has this error, try to add !important and check that the input is an password field.

Original Question:

I have a password input with a custom added "show password" button. Now I want to remove the password button which is added by MS Edge and IE. I already tried:

input[type="password"]::-ms-reveal,
input[type="password"]::-ms-clear {
  display: none;
}

and

input::-ms-reveal,
input::-ms-clear {
  display: none;
}

The ::ms-clear is working and removes the little x where the user can clear the input. But the ::ms-reveal isn't working. Tested in IE 11, MS Edge based on Chromium and newest MS Edge which isn't based on Chromium.

MS Edge, Chromium based, IE 11

The eye on the right is my custom added eye, the other one is the eye added by IE or Edge.

Here is my input styling:

/*
BASIC INPUT STYLING
*/

input, textarea, select {
    outline: none;
    border-radius: 6px;
    box-sizing: border-box;
    box-shadow: none;
    font-family: 'Roboto', sans-serif;
    font-weight: 300;
    line-height: 1;
    font-size: 16px;
    -webkit-appearance: none;
    -moz-appearance: none;
    -ms-appearance: none;
    color: #222222;
    background-color: transparent;
    border: 1px solid #CCCCCC;
    padding: 18px 22.5px;
    transition: border-color .15s ease-in-out;
    width: 100%;
}

input:focus, textarea:focus, select:focus {
    border: 1px solid #999999;
}

.input-small input, .input-small select, .input-small textarea {
    font-size: 14px;
    padding: 9px 11.25px;
}

/*
INPUT WITH ICON STYLING
*/

.input-with-icon {
    position: relative;
}

.input-with-icon input, .input-with-icon select {
    padding-right: 62.5px;
}

.input-with-icon.input-small input, .input-with-icon.input-small select {
    padding-right: 32px;
}

.input-icon-div {
    height: 51px;
    border-radius: 6px;
    background-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    position: absolute;
    right: 5px;
    bottom: 2px;
    cursor: pointer;
}

.input-small .input-icon-div {
    font-size: 14px;
    height: 27px;
    width: 25px;
}

and the HTML:

<div class="input-with-icon">
    <input type="password" name="password" id="password" class="" maxlength="255">
    <div class="input-icon-div">
        <i class="far fa-eye"></i>
    </div>
</div>