img タグ
img タグ + data スキーム
div タグ + background(+サイズ指定)
object タグ
embed タグ
iframe タグ
SVG タグで直接
%22%20stroke%3D%22%23cf142b%22%20stroke%2Dwidth%3D%224%22%2F%3E%3Cpath%20d%3D%22M30%2C0%20v30%20M0%2C15%20h60%22%20stroke%3D%22%23fff%22%20stroke%2Dwidth%3D%2210%22%2F%3E%3Cpath%20d%3D%22M30%2C0%20v30%20M0%2C15%20h60%22%20stroke%3D%22%23cf142b%22%20stroke%2Dwidth%3D%226%22%2F%3E%3C%2Fsvg%3E)