HTML + CSS, (削除) 121 (削除ここまで) 120 bytes
Worst piece of HTML I've ever wrote. One byte save thanks to @Gust van de Wal
b{color:#ff0}a{color:cyan}i{color:lime}u{color:blue<pre><body bgcolor=#f0f text=red>█<b>█
█<i>█<a>█
█<u>█HTML + CSS, 114 bytes (semi valid)
I'm putting this as semi-valid because the blue is not exactly #0000FF blue and also relies on not having clicked the link.
Thanks to @Lynn for the idea
b{color:#ff0}i{color:lime}c{color:cyan<pre><body bgcolor=#f0f text=red>█<b>█
█<i>█<c>█
█<a href=x>█HTML + CSS, (削除) 121 (削除ここまで) 120 bytes
Worst piece of HTML I've ever wrote. One byte save thanks to @Gust van de Wal
b{color:#ff0}a{color:cyan}i{color:lime}u{color:blue<pre><body bgcolor=#f0f text=red>█<b>█
█<i>█<a>█
█<u>█HTML + CSS, (削除) 121 (削除ここまで) 120 bytes
Worst piece of HTML I've ever wrote. One byte save thanks to @Gust van de Wal
b{color:#ff0}a{color:cyan}i{color:lime}u{color:blue<pre><body bgcolor=#f0f text=red>█<b>█
█<i>█<a>█
█<u>█HTML + CSS, 114 bytes (semi valid)
I'm putting this as semi-valid because the blue is not exactly #0000FF blue and also relies on not having clicked the link.
Thanks to @Lynn for the idea
b{color:#ff0}i{color:lime}c{color:cyan<pre><body bgcolor=#f0f text=red>█<b>█
█<i>█<c>█
█<a href=x>█HTML + CSS 121, (削除) 121 (削除ここまで) 120 bytes
Worst piece of HTML I've ever wrote. One byte save thanks to @Gust van de Wal
b{color:#ff0}a{color:cyan}i{color:lime}u{color:blue}<pre><body bgcolor=#f0f text=red>█<b>█
█<i>█<a>█
█<u>█HTML + CSS 121 bytes
Worst piece of HTML I've ever wrote.
b{color:#ff0}a{color:cyan}i{color:lime}u{color:blue}<pre><body bgcolor=#f0f text=red>█<b>█
█<i>█<a>█
█<u>█HTML + CSS, (削除) 121 (削除ここまで) 120 bytes
Worst piece of HTML I've ever wrote. One byte save thanks to @Gust van de Wal
b{color:#ff0}a{color:cyan}i{color:lime}u{color:blue<pre><body bgcolor=#f0f text=red>█<b>█
█<i>█<a>█
█<u>█HTML + CSS 121 bytes
Worst piece of HTML I've ever wrote.
b{color:#ff0}a{color:cyan}i{color:lime}u{color:blue}<pre><body bgcolor=#f0f text=red>█<b>█
█<i>█<a>█
█<u>█