test_repo/test_module/website_templates.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <!-- Deprecated QWeb directive "t-esc-options". -->
    <template id="test_template_1" name="Test Template 1">
        <div>
            <span t-esc="price" t-esc-options='{"widget": "monetary"}'/>
        </div>
        <section class="oe_structure">
            <p>Customize this!</p>
        </section>
        <div class="oe_structure_gotcha">
            <span>I did nothing wrong :)</span>
        </div>
        <div class="d-flex fake_oe_structure"/>
    </template>

    <!-- Deprecated QWeb directive "t-field-options". -->
    <template id="test_template_2" name="Test Template 2">
        <div>
            <span t-field="line.image" t-field-options='{"widget": "image"}'/>
        </div>
        <div id="correct_oe_structure" class="oe_structure"/>
        <body>
            <div class="oe_structure px-1 py-2">
                <span>Hello</span>
            </div>
        </body>
    </template>

    <template id="assets_backend" name="test_module_widget" inherit_id="web.assets_backend">
        <xpath expr="." position="inside">
            <!-- Wrong but is working in odoo web debug mode -->
            <link rel="stylesheet" href="/test_module_widget/static/widget.css?v=1"/>

            <script type="text/javascript" src="/test_module_affiliation_widget/static/widget.js?v=1"/>

            <!-- Correct but is working working odoo web debug mode also -->
            <link rel="stylesheet" href="/test_module_widget/static/widget.css"/>

            <script type="text/javascript" src="/test_module_affiliation_widget/static/widget.js"/>

            <script type="text/javascript" src="https://code.jquery.com/jquery-3.2.1.min.js"/>
            <script type="text/javascript" src="https://code.jquery.com/jquery-3.2.1.min.js?_ca=235"/>
        </xpath>
    </template>

</odoo>