Implement a css-only gallery, with descriptions!

It's an absolutely *glorious* series of hacks :D

Including, but certainly not limited to:

 - CSS Grids with only 1 cell
 - Flexboxes used for positioning text nodes
 - Element heights set indirectly with the width property
 - z-index abused to show the current image in the sequence


it's undefined which image will be shown initially, but given the amount 
of effort this took I'm ok with that

If anyone knows how  to shift the <picture> element 0.25em upwards 
*without* moving the image so that I can remove the upper and lower 
borders, I'd lvoe to know. I've tried everything - including settingit's 
height to zero etc. In the end I've padded out the top to balance it out 
instead :P

.docs/.eleventy.js

@@ -47,19 +47,16 @@ async function shortcode_image_url(src) {
 	return data.url;
 }
 
-async function shortcode_cssbox(content, src) {
+async function shortcode_gallerybox(content, src, idthis, idprev, idnext) {
-	let idprev = `image-${nextid}`;
+	return `<figure class="gallerybox-item" id="${idthis}">
-	nextid += 1;
+<!-- ${await shortcode_image(src, "", "gallerybox-thumb", "300w")} -->
-	let idthis = `image-${nextid}`;
+	${await shortcode_image(src, "", "", "1920w")}
-	let idnext = `image-${nextid + 1}`;
+	
-	return `<div class="cssbox">
+	<figcaption>${content}</figcaption>
-<a id="${idthis}" href="#${idthis}">${await shortcode_image(src, content, "cssbox_thumb", "300w")}
+	
-	<span class="cssbox_full">${await shortcode_image(src, content, "", "1920w")}</span>
+<a class="gallerybox-prev" href="#${idprev}">❰</a>
-</a>
+<a class="gallerybox-next" href="#${idnext}">❱</a>
-<a class="cssbox_close" href="#void"></a>
+</figure>`;
-<a class="cssbox_prev" href="#${idprev}">&lt;</a>
-<a class="cssbox_next" href="#${idnext}">&gt;</a>
-</div>`;
 }
 
 module.exports = function(eleventyConfig) {
@@ -68,5 +65,5 @@ module.exports = function(eleventyConfig) {
 	eleventyConfig.addShortcode("image", shortcode_image);
 	eleventyConfig.addJavaScriptFunction("image", shortcode_image);
 	eleventyConfig.addShortcode("image-url", shortcode_image_url);
-	eleventyConfig.addPairedShortcode("cssbox", shortcode_cssbox);
+	eleventyConfig.addPairedShortcode("gallerybox", shortcode_gallerybox);
 }

.docs/css.njk

@@ -2,4 +2,4 @@
 permalink: theme.css
 ---
 {% include "css/theme.css" %}
-{% include "css/CSSBox/cssbox.css" %}
+{% include "css/gallerybox.css" %}

.docs/css/gallerybox.css

@@ -0,0 +1,109 @@
+.gallerybox {
+	display: flex;
+	justify-content: center;
+	/*
+	The <picture /> element causes a small amount of extra padding at the
+	bottom of the element, so we use this to balance out the look at the top
+	ideally we'd shift the <picture> out of the way, but we can't without also
+	shifting the <img /> inside
+	*/
+	padding-top: 0.2em;
+}
+
+.gallerybox-gallery {
+	--gallerybox-nextprev-padding: 5vw;
+	--gallerybox-nextprev-move: 0.2em;
+	--gallerybox-nextprev-hover: 0.1em;
+	
+	max-width: 80vmax;
+	
+	display: grid;
+	grid-template-columns: auto;
+	grid-template-rows: auto;
+	grid-template-areas: "main";
+}
+
+/* .gallerybox picture {
+	position: relative;
+	top: -1em;
+}
+.gallerybox picture > img {
+	position: relative;
+	top: 1em;
+} */
+
+.gallerybox-item {
+	grid-area: main;
+	z-index: 2;
+}
+
+.gallerybox-item > figcaption {
+	background: hsla(0, 0%, 95%, 0.75);
+	position: absolute;
+	bottom: 0.25em; left: 0; right: 0;
+	padding: 0.75em 1em;
+	text-align: center;
+}
+
+.gallerybox-gallery > .gallerybox-item:target {
+	display: block;
+	z-index: 100;
+}
+/* .gallerybox-gallery > .gallerybox-item:not(:target) {
+	display: none;
+	z-index: 2;
+}
+.gallerybox-item:not(:target) ~ .gallerybox-item:last-child {
+	display: block;
+	z-index: 2;
+} */
+
+/* 
+.gallerybox-gallery:target-within > .gallerybox-item:target {
+	display: block;
+}
+.gallerybox-gallery:target-within > .gallerybox-item:not(:target) {
+	display: none;
+} */
+
+
+.gallerybox-item {
+	position: relative;
+}
+.gallerybox-item img {
+	max-width: 100%;
+}
+:where(.gallerybox-prev, .gallerybox-next) {
+	display: flex;
+	align-items: center;
+	height: 100%;
+	position: absolute; top: 0;
+	vertical-align: middle;
+	font-weight: bold;
+	font-size: 4em;
+	color: hsla(0, 0%, 100%, 0.8) !important;
+	text-decoration: none;
+	transform: none;
+	transition: transform 0.25s;
+}
+.gallerybox-item > .gallerybox-prev {
+	padding-left: var(--gallerybox-nextprev-padding);
+	left: 0;
+}
+.gallerybox-item > .gallerybox-next {
+	padding-right: var(--gallerybox-nextprev-padding);
+	right: 0;
+}
+
+
+:where(.gallerybox-prev, .gallerybox-next):hover {
+	color: hsla(0, 0%, 100%, 1) !important;
+}
+:is(.gallerybox-prev, .gallerybox-next):active {
+	color: hsla(0, 0%, 100%, 1) !important;
+}
+.gallerybox-next:hover { transform: translateX(calc(var(--gallerybox-nextprev-hover) * -1)); }
+.gallerybox-prev:hover { transform: translateX(var(--gallerybox-nextprev-hover)); }
+
+.gallerybox-prev:active { transform: translateX(calc(var(--gallerybox-nextprev-move) * -1)); }
+.gallerybox-next:active { transform: translateX(var(--gallerybox-nextprev-move)); }

.docs/css/theme.css

@@ -265,3 +265,7 @@ footer {
 	opacity: 0.75;
 	cursor: default;
 }
+
+.gallerybox {
+	background: var(--bg-transcluscent);
+}

.docs/index.html

@@ -50,11 +50,16 @@ date: 2000-01-01
 </section>
 
 <!-- Potentially we might want some inspiration from https://codepen.io/emared/pen/gWGBLR here -->
-<section class="cssbox">
+<section class="gallerybox">
-	{% cssbox "images/gallery-a.jpeg" %}
+	<section class="gallerybox-gallery">
+		{% gallerybox "images/gallery-a.jpeg" "image-first" "image-last" "image-b" %}
 			A scene demonstrating <code>//replacemix</code>, <code>//ellipsoid</code>, <code>//layers</code>, <code>smoothadv</code> (aka <code>convolve</code> and <code>conv</code>), and <code>//floodfill</code> - all of which are provided by WorldEditAdditions.
-	{% endcssbox %}
+		{% endgallerybox %}
-	{% cssbox "images/gallery-b.jpeg" %}
+		{% gallerybox "images/gallery-b.jpeg" "image-b" "image-first" "image-last" %}
 			The inside of a 3d maze made with <code>//maze3d</code>. Lighting was placed manually to improve screenshot quality.
-	{% endcssbox %}
+		{% endgallerybox %}
+		{% gallerybox "images/gallery-c.jpeg" "image-last" "image-b" "image-first" %}
+			A cliff made with <code>//erode</code> and <code>//layers</code>. A <code>//forest</code> has been applied on top with multiple sapling / tree types.
+		{% endgallerybox %}
+	</section>
 </section>