cms/installation/forms/setup.xml

<?xml version="1.0" encoding="utf-8"?>
<form addfieldprefix="Joomla\CMS\Installation\Form\Field" addruleprefix="Joomla\CMS\Installation\Form\Rule">
	<fieldset name="site">
		<field
			name="language"
			type="installation.language"
			label="INSTL_SELECT_LANGUAGE_TITLE"
			id="language"
			class="required"
			default="en-GB"
		/>
		<field
			name="site_name"
			type="text"
			label="INSTL_SITE_NAME_DESC"
			id="site_name"
			class="form-control"
			required="true"
		/>
		<field
			name="admin_email"
			type="email"
			label="INSTL_ADMIN_EMAIL_DESC"
			id="admin_email"
			class="form-control"
			validate="email"
			required="true"
		/>
		<field
			name="admin_user"
			type="text"
			label="INSTL_ADMIN_USER_DESC"
			id="admin_user"
			required="true"
			class="form-control"
			size="30"
		/>
		<field
			name="admin_username"
			type="text"
			label="INSTL_ADMIN_USERNAME_DESC"
			id="admin_username"
			required="true"
			validate="username"
			class="form-control"
			size="30"
			autocomplete="username"
		/>
		<field
			name="admin_password"
			type="password"
			label="INSTL_ADMIN_PASSWORD_DESC"
			description="INSTL_ADMIN_PASSWORD_LENGTH"
			id="admin_password"
			required="true"
			autocomplete="new-password"
			validate="password"
			strengthmeter="true"
			force="on"
			filter="raw"
		/>
		<field
			name="db_type"
			type="databaseconnection"
			label="INSTL_DATABASE_TYPE_DESC"
			id="db_type"
			class="custom-select"
			supported="mysql,mysqli,pgsql,postgresql"
			required="true"
			default="mysqli"
			filter="string"
		/>
		<field
			name="db_host"
			type="text"
			label="INSTL_DATABASE_HOST_DESC"
			id="db_host"
			class="form-control"
			default="localhost"
			required="true"
		/>
		<field
			name="db_user"
			type="text"
			label="INSTL_DATABASE_USER_DESC"
			id="db_user"
			class="form-control"
			required="true"
		/>
		<field
			name="db_pass"
			type="password"
			label="INSTL_DATABASE_PASSWORD_DESC"
			id="db_pass"
			class="form-control"
			autocomplete="off"
			filter="raw"
		/>
		<field
			name="db_name"
			type="text"
			label="INSTL_DATABASE_NAME_DESC"
			id="db_name"
			class="form-control"
			required="true"
			default="joomla_db"
		/>
	</fieldset>

	<!-- Advanced Settings -->
	<fieldset name="advanced">
		<field
			name="db_prefix"
			type="installation.prefix"
			label="INSTL_DATABASE_PREFIX_DESC"
			id="db_prefix"
			class="form-control"
			required="true"
			validate="prefix"
			message="INSTL_DATABASE_PREFIX_MSG"
			autocomplete="off"
		/>
		<field
			name="db_old"
			type="hidden"
			id="db_old"
			default="backup"
		/>

		<field
			name="db_encryption"
			type="list"
			label="INSTL_DATABASE_ENCRYPTION_MODE_LABEL"
			class="custom-select"
			required="true"
			default="0"
			filter="integer"
			>
			<option value="0">INSTL_DATABASE_ENCRYPTION_MODE_VALUE_NONE</option>
			<option value="1">INSTL_DATABASE_ENCRYPTION_MODE_VALUE_ONE_WAY</option>
			<option value="2">INSTL_DATABASE_ENCRYPTION_MODE_VALUE_TWO_WAY</option>
		</field>

		<field
			name="db_sslkey"
			type="text"
			label="INSTL_DATABASE_ENCRYPTION_KEY_LABEL"
			filter="path"
			showon="db_encryption:2"
		/>

		<field
			name="db_sslcert"
			type="text"
			label="INSTL_DATABASE_ENCRYPTION_CERT_LABEL"
			filter="path"
			showon="db_encryption:2"
		/>

		<field
			name="db_sslverifyservercert"
			type="radio"
			label="INSTL_DATABASE_ENCRYPTION_VERIFY_SERVER_CERT_LABEL"
			layout="joomla.form.field.radio.switcher"
			default="0"
			filter="boolean"
			showon="db_encryption:1,2"
			>
			<option value="0">JNO</option>
			<option value="1">JYES</option>
		</field>

		<field
			name="db_sslca"
			type="text"
			label="INSTL_DATABASE_ENCRYPTION_CA_LABEL"
			filter="path"
			showon="db_encryption:1,2[AND]db_sslverifyservercert:1"
		/>

		<field
			name="db_sslcipher"
			type="text"
			label="INSTL_DATABASE_ENCRYPTION_CIPHER_LABEL"
			filter="string"
			showon="db_type:mysql,mysqli[AND]db_encryption:2"
		/>

	</fieldset>
</form>