Runs/html · chain · Fable 5.1/055
html · chain · Fable 5.1 · step 055 of 64
offline render, Chrome 154, light scheme, 2 s of virtual time
runs in a sandboxed frame with no origin; live pages may fetch CDN fonts the offline render did not
<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
<meta name="color-scheme" content="light dark">
<title>0</title>
<link rel="icon" href="data:,">
<style>
html {
-webkit-text-size-adjust: 100%;
text-size-adjust: 100%;
scrollbar-gutter: stable;
}
body {
max-inline-size: 40rem;
margin-block: 0;
margin-inline: auto;
padding:
max(1.5rem, env(safe-area-inset-top))
max(1.5rem, env(safe-area-inset-right))
max(1.5rem, env(safe-area-inset-bottom))
max(1.5rem, env(safe-area-inset-left));
font: 100%/1.5 system-ui, sans-serif;
overflow-wrap: break-word;
}
h1, h2, h3, h4, h5, h6 {
margin-block: 0 1rem;
line-height: 1.2;
text-wrap: balance;
}
h1 {
font-size: clamp(2rem, 1.5rem + 2.5vi, 3rem);
}
h5, h6 {
font-size: 1rem;
}
hgroup {
margin-block-end: 1rem;
}
:is(h1, h2, h3, h4, h5, h6, hgroup):where(:not(:first-child)) {
margin-block-start: 2rem;
}
:is(article, aside, nav, section):where(:not(:first-child)) > :is(h1, h2, h3, h4, h5, h6, hgroup, header):first-child {
margin-block-start: 2rem;
}
:is(h1, h2, h3, h4, h5, h6, hgroup) + :is(h1, h2, h3, h4, h5, h6, hgroup) {
margin-block-start: 0;
}
:is(h1, h2, h3, h4, h5, h6, hgroup) + :is(article, aside, nav, section) > :is(h1, h2, h3, h4, h5, h6, hgroup, header):first-child {
margin-block-start: 0;
}
hgroup > :is(h1, h2, h3, h4, h5, h6, p) {
margin-block: 0;
}
p, ul, ol, menu, dl, blockquote, pre, table, figure, details, address, fieldset, form, search, header {
margin-block: 0 1rem;
}
body > header {
margin-block-end: 2rem;
}
body > footer {
margin-block-start: 2rem;
}
hr {
margin-block: 2rem;
border: 0;
border-block-start: 1px solid;
color: inherit;
}
a {
text-underline-offset: 0.15em;
}
abbr[title] {
text-decoration-line: underline;
text-decoration-style: dotted;
}
p, li, dt, dd, blockquote, figcaption, caption {
text-wrap: pretty;
}
figure {
margin-inline: 0;
}
figure > :has(+ figcaption) {
margin-block-end: 0;
}
figcaption {
margin-block-start: 0.5rem;
}
figcaption:first-child {
margin-block: 0 0.5rem;
}
blockquote {
margin-inline: 0;
padding-inline-start: 1rem;
border-inline-start: 0.25rem solid;
}
dt {
font-weight: bold;
}
ul, ol, menu {
padding-inline-start: 1.5rem;
}
dd {
margin-inline-start: 1.5rem;
}
dd + dt, dl > div + div {
margin-block-start: 0.5rem;
}
li > ul, li > ol, li > menu {
margin-block-end: 0;
}
li:has(> p) + li, li + li:has(> p) {
margin-block-start: 1rem;
}
pre, code, kbd, samp {
font-family: ui-monospace, monospace;
font-size: 1em;
}
pre {
overflow-x: auto;
tab-size: 2;
}
sub, sup {
line-height: 0;
}
button, input, select, textarea, ::file-selector-button {
font: inherit;
letter-spacing: inherit;
word-spacing: inherit;
box-sizing: border-box;
}
fieldset {
min-inline-size: 0;
margin-inline: 0;
}
textarea {
resize: vertical;
}
table {
display: block;
max-inline-size: 100%;
overflow-x: auto;
border-collapse: collapse;
font-variant-numeric: tabular-nums;
}
th, td {
padding: 0.25rem 0.5rem;
border-block-end: 1px solid;
text-align: start;
vertical-align: top;
}
thead th {
vertical-align: bottom;
}
caption {
padding: 0.25rem 0.5rem;
text-align: start;
}
summary {
cursor: pointer;
}
summary > :is(h1, h2, h3, h4, h5, h6) {
display: inline;
}
:focus-visible {
outline: 2px solid;
outline-offset: 2px;
}
:target {
scroll-margin-block-start: max(1.5rem, env(safe-area-inset-top));
}
:is(body, main, header, footer, blockquote, figure, li, dd, td, th, fieldset, details, dialog, [popover]) > :last-child:where(:not(dialog, [popover])) {
margin-block-end: 0;
}
:last-child:where(:not(dialog, [popover], :not(:last-child) *)) {
margin-block-end: 0;
}
iframe {
border: 0;
}
img, svg, video, canvas, audio, iframe, embed, object, button, input, select, textarea, progress, meter {
max-inline-size: 100%;
}
img, svg, video, canvas {
vertical-align: middle;
}
img, svg[viewBox], video, canvas {
block-size: auto;
}
[hidden]:not([hidden="until-found" i]) {
display: none !important;
}
details[open] > summary {
margin-block-end: 0.5rem;
}
@media print {
body {
max-inline-size: none;
padding: 0;
}
h1, h2, h3, h4, h5, h6, hgroup {
break-after: avoid;
break-inside: avoid;
}
p, li, dd, blockquote {
orphans: 3;
widows: 3;
}
a[href^="http"]::after {
content: " (" attr(href) ")";
font-size: 0.875em;
}
abbr[title]::after {
content: " (" attr(title) ")";
}
pre {
white-space: pre-wrap;
}
details::details-content {
content-visibility: visible;
}
summary {
margin-block-end: 0.5rem;
}
table {
display: table;
}
img, svg, video, canvas, figure, blockquote, tr, fieldset {
break-inside: avoid;
}
}
</style>
<main>
<h1>0</h1>
</main>
what changed from step 054
+3 / -0 lines
margin-block-end: 0; }+ :last-child:where(:not(dialog, [popover], :not(:last-child) *)) {+ margin-block-end: 0;+ } iframe { border: 0;
What the model said
I made one change to `0.html`, and it is untested: the headless-browser check I tried to run was blocked by this session's permissions.
## What changed
The file was already a tight classless base stylesheet, so I only fixed one spacing inconsistency, at `0.html:175`:
```css
:last-child:where(:not(dialog, [popover], :not(:last-child) *)) {
margin-block-end: 0;
}
```
**The problem:** the existing rule strips the trailing margin only from direct children of `body`, `main` and similar containers. With a wrapper such as `<main><section><p>…</p></section></main>`, the paragraph's `1rem` bottom margin collapses through the `section` and `main`. The page then ends with 2.5rem of space instead of 1.5rem.
**The fix:** the new rule zeroes the trailing margin on any element that is a last child all the way up the tree, however deeply it is wrapped. Elements inside a wrapper that is not last are untouched, so the gap between two sibling `<article>`s stays the same. `dialog` and `[popover]` are excluded, as in the existing rule, so their centring margins still work.
## Worth checking
- Open a page with nested `section`/`article` content and confirm the bottom spacing matches the top.
- The rule relies on the root element matching `:last-child`, which current Chrome, Firefox and Safari do. In a browser that doesn't, the rule does nothing.
## Left alone
- **Title and heading:** `<title>0</title>` and `<h1>0</h1>` look like placeholders, and there is no `<meta name="description">`. I didn't invent content for them.
- **Visual design:** I added no colours, fonts or other styling, since the file reads as a deliberately neutral base.