Este es el primer vistazo del html que trae WordPress por defecto en el wp_head() y en el wp_footer(). Lo único que está que no se incluye es lo que está al comienzo de la etiqueta <body> que es un texto que yo mismo he colocado en el index.php.
<!DOCTYPE html>
<html lang="en-US" class="no-js">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="profile" href="http://gmpg.org/xfn/11">
<meta name='robots' content='max-image-preview:large' />
<link rel='dns-prefetch' href='//s.w.org' />
<script type="text/javascript">
window._wpemojiSettings = {"baseUrl":"https:\/\/s.w.org\/images\/core\/emoji\/13.1.0\/72x72\/","ext":".png","svgUrl":"https:\/\/s.w.org\/images\/core\/emoji\/13.1.0\/svg\/","svgExt":".svg","source":{"concatemoji":"https:\/\/test.brigzen.com\/wp-includes\/js\/wp-emoji-release.min.js?ver=5.8"}};
!function(e,a,t){var n,r,o,i=a.createElement("canvas"),p=i.getContext&&i.getContext("2d");function s(e,t){var a=String.fromCharCode;p.clearRect(0,0,i.width,i.height),p.fillText(a.apply(this,e),0,0);e=i.toDataURL();return p.clearRect(0,0,i.width,i.height),p.fillText(a.apply(this,t),0,0),e===i.toDataURL()}function c(e){var t=a.createElement("script");t.src=e,t.defer=t.type="text/javascript",a.getElementsByTagName("head")[0].appendChild(t)}for(o=Array("flag","emoji"),t.supports={everything:!0,everythingExceptFlag:!0},r=0;r<o.length;r++)t.supports[o[r]]=function(e){if(!p||!p.fillText)return!1;switch(p.textBaseline="top",p.font="600 32px Arial",e){case"flag":return s([127987,65039,8205,9895,65039],[127987,65039,8203,9895,65039])?!1:!s([55356,56826,55356,56819],[55356,56826,8203,55356,56819])&&!s([55356,57332,56128,56423,56128,56418,56128,56421,56128,56430,56128,56423,56128,56447],[55356,57332,8203,56128,56423,8203,56128,56418,8203,56128,56421,8203,56128,56430,8203,56128,56423,8203,56128,56447]);case"emoji":return!s([10084,65039,8205,55357,56613],[10084,65039,8203,55357,56613])}return!1}(o[r]),t.supports.everything=t.supports.everything&&t.supports[o[r]],"flag"!==o[r]&&(t.supports.everythingExceptFlag=t.supports.everythingExceptFlag&&t.supports[o[r]]);t.supports.everythingExceptFlag=t.supports.everythingExceptFlag&&!t.supports.flag,t.DOMReady=!1,t.readyCallback=function(){t.DOMReady=!0},t.supports.everything||(n=function(){t.readyCallback()},a.addEventListener?(a.addEventListener("DOMContentLoaded",n,!1),e.addEventListener("load",n,!1)):(e.attachEvent("onload",n),a.attachEvent("onreadystatechange",function(){"complete"===a.readyState&&t.readyCallback()})),(n=t.source||{}).concatemoji?c(n.concatemoji):n.wpemoji&&n.twemoji&&(c(n.twemoji),c(n.wpemoji)))}(window,document,window._wpemojiSettings);
</script>
<style type="text/css">
img.wp-smiley,
img.emoji {
display: inline !important;
border: none !important;
box-shadow: none !important;
height: 1em !important;
width: 1em !important;
margin: 0 .07em !important;
vertical-align: -0.1em !important;
background: none !important;
padding: 0 !important;
}
</style>
<link rel='stylesheet' id='dashicons-css' href='https://test.brigzen.com/wp-includes/css/dashicons.min.css?ver=5.8' type='text/css' media='all' />
<link rel='stylesheet' id='admin-bar-css' href='https://test.brigzen.com/wp-includes/css/admin-bar.min.css?ver=5.8' type='text/css' media='all' />
<link rel='stylesheet' id='wp-block-library-css' href='https://test.brigzen.com/wp-includes/css/dist/block-library/style.min.css?ver=5.8' type='text/css' media='all' />
<link rel="https://api.w.org/" href="https://test.brigzen.com/wp-json/" /><link rel="EditURI" type="application/rsd+xml" title="RSD" href="https://test.brigzen.com/xmlrpc.php?rsd" />
<link rel="wlwmanifest" type="application/wlwmanifest+xml" href="https://test.brigzen.com/wp-includes/wlwmanifest.xml" />
<meta name="generator" content="WordPress 5.8" />
<style type="text/css" media="print">#wpadminbar { display:none; }</style>
<style type="text/css" media="screen">
html { margin-top: 32px !important; }
* html body { margin-top: 32px !important; }
@media screen and ( max-width: 782px ) {
html { margin-top: 46px !important; }
* html body { margin-top: 46px !important; }
}
</style>
</head>
<body class="home blog logged-in admin-bar no-customize-support">
My Awesome Theme
<script type='text/javascript' src='https://test.brigzen.com/wp-includes/js/hoverintent-js.min.js?ver=2.2.1' id='hoverintent-js-js'></script>
<script type='text/javascript' src='https://test.brigzen.com/wp-includes/js/admin-bar.min.js?ver=5.8' id='admin-bar-js'></script>
<script type='text/javascript' src='https://test.brigzen.com/wp-includes/js/wp-embed.min.js?ver=5.8' id='wp-embed-js'></script>
<script type="text/javascript">
(function() {
var request, b = document.body, c = 'className', cs = 'customize-support', rcs = new RegExp('(^|\\s+)(no-)?'+cs+'(\\s+|$)');
request = true;
b[c] = b[c].replace( rcs, ' ' );
// The customizer requires postMessage and CORS (if the site is cross domain).
b[c] += ( window.postMessage && request ? ' ' : ' no-' ) + cs;
}());
</script>
<div id="wpadminbar" class="nojq nojs">
<a class="screen-reader-shortcut" href="#wp-toolbar" tabindex="1">Skip to toolbar</a>
<div class="quicklinks" id="wp-toolbar" role="navigation" aria-label="Toolbar">
<ul id='wp-admin-bar-root-default' class="ab-top-menu"><li id='wp-admin-bar-wp-logo' class="menupop"><a class='ab-item' aria-haspopup="true" href='https://test.brigzen.com/wp-admin/about.php'><span class="ab-icon" aria-hidden="true"></span><span class="screen-reader-text">About WordPress</span></a><div class="ab-sub-wrapper"><ul id='wp-admin-bar-wp-logo-default' class="ab-submenu"><li id='wp-admin-bar-about'><a class='ab-item' href='https://test.brigzen.com/wp-admin/about.php'>About WordPress</a></li></ul><ul id='wp-admin-bar-wp-logo-external' class="ab-sub-secondary ab-submenu"><li id='wp-admin-bar-wporg'><a class='ab-item' href='https://wordpress.org/'>WordPress.org</a></li><li id='wp-admin-bar-documentation'><a class='ab-item' href='https://wordpress.org/support/'>Documentation</a></li><li id='wp-admin-bar-support-forums'><a class='ab-item' href='https://wordpress.org/support/forums/'>Support</a></li><li id='wp-admin-bar-feedback'><a class='ab-item' href='https://wordpress.org/support/forum/requests-and-feedback'>Feedback</a></li></ul></div></li><li id='wp-admin-bar-site-name' class="menupop"><a class='ab-item' aria-haspopup="true" href='https://test.brigzen.com/wp-admin/'>Pruebas de Brigzen</a><div class="ab-sub-wrapper"><ul id='wp-admin-bar-site-name-default' class="ab-submenu"><li id='wp-admin-bar-dashboard'><a class='ab-item' href='https://test.brigzen.com/wp-admin/'>Dashboard</a></li></ul><ul id='wp-admin-bar-appearance' class="ab-submenu"><li id='wp-admin-bar-themes'><a class='ab-item' href='https://test.brigzen.com/wp-admin/themes.php'>Themes</a></li></ul></div></li><li id='wp-admin-bar-customize' class="hide-if-no-customize"><a class='ab-item' href='https://test.brigzen.com/wp-admin/customize.php?url=https%3A%2F%2Ftest.brigzen.com%2F'>Customize</a></li><li id='wp-admin-bar-comments'><a class='ab-item' href='https://test.brigzen.com/wp-admin/edit-comments.php'><span class="ab-icon" aria-hidden="true"></span><span class="ab-label awaiting-mod pending-count count-0" aria-hidden="true">0</span><span class="screen-reader-text comments-in-moderation-text">0 Comments in moderation</span></a></li><li id='wp-admin-bar-new-content' class="menupop"><a class='ab-item' aria-haspopup="true" href='https://test.brigzen.com/wp-admin/post-new.php'><span class="ab-icon" aria-hidden="true"></span><span class="ab-label">New</span></a><div class="ab-sub-wrapper"><ul id='wp-admin-bar-new-content-default' class="ab-submenu"><li id='wp-admin-bar-new-post'><a class='ab-item' href='https://test.brigzen.com/wp-admin/post-new.php'>Post</a></li><li id='wp-admin-bar-new-media'><a class='ab-item' href='https://test.brigzen.com/wp-admin/media-new.php'>Media</a></li><li id='wp-admin-bar-new-page'><a class='ab-item' href='https://test.brigzen.com/wp-admin/post-new.php?post_type=page'>Page</a></li><li id='wp-admin-bar-new-user'><a class='ab-item' href='https://test.brigzen.com/wp-admin/user-new.php'>User</a></li></ul></div></li></ul><ul id='wp-admin-bar-top-secondary' class="ab-top-secondary ab-top-menu"><li id='wp-admin-bar-search' class="admin-bar-search"><div class="ab-item ab-empty-item" tabindex="-1"><form action="https://test.brigzen.com/" method="get" id="adminbarsearch"><input class="adminbar-input" name="s" id="adminbar-search" type="text" value="" maxlength="150" /><label for="adminbar-search" class="screen-reader-text">Search</label><input type="submit" class="adminbar-button" value="Search" /></form></div></li><li id='wp-admin-bar-my-account' class="menupop with-avatar"><a class='ab-item' aria-haspopup="true" href='https://test.brigzen.com/wp-admin/profile.php'>Howdy, <span class="display-name">brigzen</span><img alt='' src='https://secure.gravatar.com/avatar/cf7554fb8fe5c4e1431bfa203d62a3b0?s=26&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/cf7554fb8fe5c4e1431bfa203d62a3b0?s=52&d=mm&r=g 2x' class='avatar avatar-26 photo' height='26' width='26' loading='lazy'/></a><div class="ab-sub-wrapper"><ul id='wp-admin-bar-user-actions' class="ab-submenu"><li id='wp-admin-bar-user-info'><a class='ab-item' tabindex="-1" href='https://test.brigzen.com/wp-admin/profile.php'><img alt='' src='https://secure.gravatar.com/avatar/cf7554fb8fe5c4e1431bfa203d62a3b0?s=64&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/cf7554fb8fe5c4e1431bfa203d62a3b0?s=128&d=mm&r=g 2x' class='avatar avatar-64 photo' height='64' width='64' loading='lazy'/><span class='display-name'>brigzen</span></a></li><li id='wp-admin-bar-edit-profile'><a class='ab-item' href='https://test.brigzen.com/wp-admin/profile.php'>Edit Profile</a></li><li id='wp-admin-bar-logout'><a class='ab-item' href='https://test.brigzen.com/wp-login.php?action=logout&_wpnonce=e2904082b9'>Log Out</a></li></ul></div></li></ul> </div>
<a class="screen-reader-shortcut" href="https://test.brigzen.com/wp-login.php?action=logout&_wpnonce=e2904082b9">Log Out</a>
</div>
</body>
</html>Si no se aprecia bien se puede ver el código fuente de esta página y de esa manera arregla un poco este código que es lo que vas a ver en el entry-content.