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HTML

              
                <p>This demo illustrates the relationship between Form Field Errors and Form Field Groups. Set `visible` prop in Field Errors and `error` prop in Field Groups to `true` to show error state. By default, they are set to  `false`. </p>
<p>`show()`and `hide()` methods in Field Errors are deprecated and will be removed in 3.0.</p>

<div class="controls">
	<mds-button id="show-error" type="button">Show Error</mds-button>
	<mds-button id="hide-error" type="button">Hide Error</mds-button>
</div>

<form class="mds-form mds-form--medium-layout">
	<mds-field-group id="last-name-field-group">
		<mds-label text="Last Name" required="true" required-text="Please provide your last name." for="last-name-input"></mds-label>
		<mds-input aria-describedby="last-name-input__error" id="last-name-input"></mds-input>
		<mds-field-error text="Please provide your last name." id="last-name-input__error"></mds-field-error>
	</mds-field-group>
</form>
              
            
!

CSS

              
                body {
	padding: $mds-space-4-x;
}

.controls {
  margin-bottom: $mds-space-4-x;
}
              
            
!

JS

              
                const showErrorButton = document.getElementById("show-error");
const hideErrorButton = document.getElementById("hide-error");

showErrorButton.addEventListener("click", () => {
	const fieldGroup = document.getElementById("last-name-field-group");
	const fieldError = document.getElementById("last-name-input__error");
	fieldError.visible = true;
	fieldGroup.error = true;
});

hideErrorButton.addEventListener("click", () => {
	const fieldGroup = document.getElementById("last-name-field-group");
	const fieldError = document.getElementById("last-name-input__error");
	fieldError.visible = false;
	fieldGroup.error = false;
});

              
            
!
999px

Console