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usagi/test.html

Last active August 19, 2022 04:52
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test.html
<!DOCTYPE html>
<style>
/* HTML要素の「文字」を対象に擬似的に縁取りする CSS の例 */
:root {
/* 輪郭線にしたい色 */
--shadow-color: #333;
/* 輪郭線にしたい幅(長さ) */
--shadow-thickness: 0.5mm;
/* 輪郭線にしたい幅の2倍の + 向きの長さ = + 向きのオフセット値 */
--shadow-offset-positive: calc(var(--shadow-thickness) * 2);
/* 輪郭線にしたい幅の2倍の - 向きの長さ = - 向きのオフセット値 */
--shadow-offset-negative: calc(var(--shadow-offset-positive) * -1);
/* 8方向に影を出して擬似的に輪郭線を縁取る text-shadow 用の設定 */
--shadow:
/* 影付けの向き①↘: +x, +y = 右下 */
var(--shadow-offset-positive) var(--shadow-offset-positive) var(--shadow-thickness) var(--shadow-color),
/* 影付けの向き②↙: -x, +y = 左下 */
var(--shadow-offset-negative) var(--shadow-offset-positive) var(--shadow-thickness) var(--shadow-color),
/* 影付けの向き③➚: +x, -y = 右上 */
var(--shadow-offset-positive) var(--shadow-offset-negative) var(--shadow-thickness) var(--shadow-color),
/* 影付けの向き④↖: -x, -y = 左上 */
var(--shadow-offset-negative) var(--shadow-offset-negative) var(--shadow-thickness) var(--shadow-color),
/* 影付けの向き⑤→: +x, 0 = 右 */
var(--shadow-offset-positive) 0 var(--shadow-thickness) var(--shadow-color),
/* 影付けの向き⑥↓: 0, +y = 下 */
0 var(--shadow-offset-positive) var(--shadow-thickness) var(--shadow-color),
/* 影付けの向き⑦←: -x, 0 = 左 */
var(--shadow-offset-negative) 0 var(--shadow-thickness) var(--shadow-color),
/* 影付けの向き⑧↑: 0, -y = 上 */
0 var(--shadow-offset-negative) var(--shadow-thickness) var(--shadow-color);
}
body * {
border: hsla(0, 50%, 50%, 0.5) solid 4mm;
}
body {
background-color: #888;
color: #fff;
font-size: 20mm;
}
#html-text {
background-color: yellow;
color: #fff;
text-shadow: var(--shadow);
}
img {
background-color: yellow;
width: 60mm;
}
.x2{
width: 120mm;
}
</style>
<!-- 例A: HTML の文字列要素 + CSS による擬似的な縁取り -->
<p id="html-text">"This 😊 is a happy symbol."</p>
<!-- 例B: HTML に img で読み込む SVG + SVG の内部で stroke で縁取り -->
<img id="with-stroke" src="with-stroke.svg" />
<!-- 例C: HTML に img で読み込む SVG + SVG の内部で shadow で縁取り -->
<img id="with-shadow" src="with-shadow.svg" />
<br/>
<img class="x2" id="with-stroke" src="with-stroke.svg" />
<img class="x2" id="with-stroke" src="with-shadow.svg" />
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with-shadow.svg
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with-stroke.svg
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