เรื่องง่ายๆระหว่าง css แยกและ css รวมในไฟล์ html

css (แยก) หรือ .css นั้นเอง
css แยกจะมีคำสั่งดึงไฟล์ css ขึ้นมารันใน html นั้นเอง
ส่วน css (รวม) หรือ คำสั่งนั้นเอง
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datetime="2011-05-11T09:24:15+07:00" title="11 พฤษภาคม 2554 เวลา 09:24 น." > 14 ปีที่แล้ว <span style="display:block;font-size:0.72rem;">11 พฤษภาคม 2554</span> </time> </header> <div class="reply-body"> <link rel="stylesheet" type="text/css" href="style.css" /><br /> <br /> อันนี้ดึงสไตล์เกิดเขียนเยอะ ไม่อยากให้รก head ครับหุหุ<br /> </div> </article> <article class="reply-item" style="position:relative;" id="reply-22456"> <span class="reply-number" aria-label="ตอบที่ 2">#2</span> <header class="reply-header"> <img src="http://a4.sphotos.ak.fbcdn.net/hphotos-ak-ash4/304106_254214974622096_100001007860892_721991_1977919090_n.jpg" alt="—•Ⓢ┈ⓉⒶⓃⒼ•—" class="reply-avatar" loading="lazy" width="38" height="38" > <div> <div class="reply-author-name">—•Ⓢ┈ⓉⒶⓃⒼ•—</div> <div class="reply-author-posts text-xs text-muted"> 21 โพสต์ </div> </div> <time class="reply-date" datetime="2011-05-11T21:05:27+07:00" title="11 พฤษภาคม 2554 เวลา 21:05 น." > 14 ปีที่แล้ว <span style="display:block;font-size:0.72rem;">11 พฤษภาคม 2554</span> </time> </header> <div class="reply-body"> ใช่แล้วค๊า...พี่โมชิเพราะบางคน(เซียน)จะเขียนโค้ดเยอะมากๆแล้วมันจะรกอ่าค่ะพี่โม.. </div> </article> <!-- Pagination --> </div> </div><!-- /.article-main --> <!-- ── Sidebar ────────────────────────────────────────────────────── --> <aside class="sidebar" aria-label="แถบข้างบทความ"> <!-- Article Info --> <div class="sidebar-widget"> <div class="sidebar-widget-title">📊 ข้อมูลกระทู้</div> <ul style="list-style:none;font-size:0.875rem;color:var(--text-secondary);"> <li style="padding:0.4rem 0;border-bottom:1px solid rgba(255,255,255,0.04);"> 👁 ดู 14,226 ครั้ง </li> <li style="padding:0.4rem 0;border-bottom:1px solid rgba(255,255,255,0.04);"> 💬 ตอบ 2 ครั้ง </li> <li style="padding:0.4rem 0;border-bottom:1px solid rgba(255,255,255,0.04);"> 📅 10 พฤษภาคม 2554 เวลา 22:38 น. </li> <li style="padding:0.4rem 0;"> 📁 <a 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