when I use the w3c validator on my website home page I get this error: Element script must not have attribute defer unless attribute src is also specified.

how to fix the error to comply with HTML specifications.
I inspected odoo addons and found this file odoo15/odoo/addons/base/models/assetsbundle.py:

def to_node(self, css=True, js=True, debug=False, async_load=False, defer_load=False, lazy_load=False):
    """
    :returns [(tagName, attributes, content)] if the tag is auto close
    """
response = []
    is_debug_assets = debug and 'assets' in debug
    if css and self.stylesheets:
        css_attachments = self.css(is_minified=not is_debug_assets) or []
        for attachment in css_attachments:
            if is_debug_assets:
                href = self.get_debug_asset_url(extra='rtl/' if self.user_direction == 'rtl' else '',
name=css_attachments.name,
extension='')
            else:
                href = attachment.url
            attr = dict([
                ["type", "text/css"],
["rel", "stylesheet"],
["href", href],
['data-asset-bundle', self.name],
['data-asset-version', self.version],
])
            response.append(("link", attr, None))
        if self.css_errors:
            msg = '\n'.join(self.css_errors)
            response.append(JavascriptAsset(self, inline=self.dialog_message(msg)).to_node())
            response.append(StylesheetAsset(self, url="/web/static/lib/bootstrap/dist/css/bootstrap.css").to_node())

    if js and self.javascripts:
        js_attachment = self.js(is_minified=not is_debug_assets)
        src = self.get_debug_asset_url(name=js_attachment.name, extension='') if is_debug_assets else js_attachment[0].url
        attr = dict([
            ["async", "async" if async_load else None],
["defer", "defer" if defer_load or lazy_load else None],
["type", "text/javascript"],
["data-src" if lazy_load else "src", src],
['data-asset-bundle', self.name],
['data-asset-version', self.version],
])
        response.append(("script", attr, None))

    return response