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Add icon to Accordion header

You can add the icon custom css class to the Accordion header using IconCss property and also add css styles to the defined class. The accordion icon element is rendered before the header text in the DOM element.

@using Syncfusion.EJ2.Blazor.Navigations

<EjsAccordion>
    <AccordionItems>
        <AccordionItem Header="Athletics" IconCss="e-athletics e-acrdn-icons" Expanded="true">
            <ContentTemplate>
                <ul>
                    <li><span class="e-acrdn-icons e-content-icon marathon"></span> Marathon</li>
                    <li><span class="e-acrdn-icons e-content-icon javelin"></span> Javelin Throw</li>
                    <li><span class="e-acrdn-icons e-content-icon discus"></span> Discus Throw</li>
                    <li><span class="e-acrdn-icons e-content-icon highjump"></span> High Jump</li>
                    <li><span class="e-acrdn-icons e-content-icon longjump"></span> Long Jump</li>
                </ul>
            </ContentTemplate>
        </AccordionItem>
        <AccordionItem Header="Water Games" IconCss="e-water-game e-acrdn-icons">
            <ContentTemplate>
                <ul>
                    <li><span class="e-acrdn-icons e-content-icon dive"></span> Diving</li>
                    <li><span class="e-acrdn-icons e-content-icon swimming"></span> Swimming</li>
                    <li><span class="e-acrdn-icons e-content-icon marathan_swim"></span> Marathon Swimming</li>
                    <li><span class="e-acrdn-icons e-content-icon sync_swim"></span> Synchronized Swimming</li>
                    <li><span class="e-acrdn-icons e-content-icon waterpolo"></span> Water Polo</li>
                </ul>
            </ContentTemplate>
        </AccordionItem>
        <AccordionItem Header="Racing" IconCss="e-racing-games e-acrdn-icons">
            <ContentTemplate>
                <ul>
                    <li><span class="e-acrdn-icons e-content-icon cycle_BMX"></span> Cycling BMX</li>
                    <li> <span class="e-acrdn-icons e-content-icon cycle_Mountain"></span> Cycling Mountain Bike</li>
                    <li> <span class="e-acrdn-icons e-content-icon cycle"></span> Cycle Racing</li>
                    <li> <span class="e-acrdn-icons e-content-icon sailing"></span> Sailing</li>
                    <li> <span class="e-acrdn-icons e-content-icon rowing"></span> Rowing</li>
                </ul>
            </ContentTemplate>
        </AccordionItem>
        <AccordionItem Header="Indoor Games" IconCss="e-indoor-games e-acrdn-icons">
            <ContentTemplate>
                <ul>
                    <li><span class="e-acrdn-icons e-content-icon tennis"></span> Table Tennis</li>
                    <li> <span class="e-acrdn-icons e-content-icon badminton"></span> Badminton</li>
                    <li> <span class="e-acrdn-icons e-content-icon volleyball"></span> Volleyball</li>
                    <li> <span class="e-acrdn-icons e-content-icon boxing"></span> Boxing</li>
                    <li> <span class="e-acrdn-icons e-content-icon swimming_In"></span> Swimming</li>
                </ul>
            </ContentTemplate>
        </AccordionItem>
    </AccordionItems>
</EjsAccordion>

<style>
    @@font-face {
        font-family: 'acrdn-icons';
        src: 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) format('truetype');
        font-weight: normal;
        font-style: normal;
    }

    .e-acrdn-icons {
        font-family: 'acrdn-icons';
        font-size: 16px;
    }

    .cycle_BMX::before {
        content: "\e702"
    }

    .javelin::before {
        content: "\e700";
    }

    .marathon::before {
        content: "\e70e";
    }

    .tennis::before {
        content: "\e701";
    }

    .waterpolo::before {
        content: "\e703";
    }

    .swimming::before {
        content: "\e704";
        position: relative;
        top: 5px;
    }

    .discus::before {
        content: "\e705";
    }

    .boxing::before {
        content: "\e706";
    }

    .rowing::before {
        content: "\e707";
    }

    .highjump::before {
        content: "\e708";
    }

    .cycle::before {
        content: "\e70a";
    }

    .sailing::before {
        content: "\e70c";
    }

    .marathan_swim::before {
        content: "\e70d";
    }

    .boxing::before {
        content: "\e706";
    }

    .dive::before {
        content: "\e70f";
    }

    .swimming_In::before {
        content: "\e710";
        position: relative;
        top: 2px;
    }

    .badminton::before {
        content: "\e711";
    }

    .sync_swim::before {
        content: "\e713";
        position: relative;
        top: 3px;
    }

    .volleyball::before {
        content: "\e714";
    }

    .cycle_Mountain::before {
        content: "\e716";
    }

    .longjump::before {
        content: "\e717";
    }

    .e-athletics::before {
        content: "\e715";
    }

    .e-water-game::before {
        content: "\e70b";
    }

    .e-racing-games::before {
        content: "\e712";
    }

    .e-indoor-games::before {
        content: "\e709";
    }

    .e-acrdn-icons:not(.e-icons) {
        padding: 0 16px 0 0;
        vertical-align: middle;
    }

    li {
        line-height: 36px;
        list-style-type: none;
        text-indent: 16px;
    }
</style>

Output be like the below.

Accordion Component with header icon