Runs/html · chain · Fable 5.1/044
html · chain · Fable 5.1 · step 044 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%;
}
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: underline dotted;
}
p, li, dt, dd, blockquote, figcaption, caption {
text-wrap: pretty;
}
figure {
margin-inline: 0;
}
figcaption {
margin-block-start: 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;
}
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, optgroup, textarea, ::file-selector-button {
font: inherit;
letter-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 {
margin-block-end: 0;
}
iframe {
border: 0;
}
img, svg, video, canvas, audio, iframe, embed, object, button, input, select, textarea {
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;
}
table {
display: table;
}
img, svg, video, canvas, figure, blockquote, tr, fieldset {
break-inside: avoid;
}
}
</style>
<main>
<h1>0</h1>
</main>
what changed from step 043
+3 / -3 lines
margin-block-start: 2rem; }- :is(article, aside, nav, section):where(:not(:first-child)) > :is(h1, h2, h3, h4, h5, h6, hgroup):first-child {+ :is(article, aside, nav, section):where(:not(:first-child)) > :is(h1, h2, h3, h4, h5, h6, hgroup, header):first-child { margin-block-start: 2rem; }⋯ line 46 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):first-child {+ :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; }⋯ line 52 margin-block: 0; }- p, ul, ol, menu, dl, blockquote, pre, table, figure, details, address, fieldset, form, search {+ p, ul, ol, menu, dl, blockquote, pre, table, figure, details, address, fieldset, form, search, header { margin-block: 0 1rem; }
What the model said
I fixed one real spacing bug in `0.html` and otherwise left it alone, because the stylesheet is already in good shape. The change is not browser-tested: the command to locate Chrome for a render check was denied in this session, so it is verified only by reading the cascade.
## The bug
In the common `<article><header><h2>…</h2></header><p>…` pattern, spacing broke in two ways:
- **No gap below the title:** `header > :last-child` zeroed the heading's bottom margin, and only `body > header` had a margin of its own, so the title sat flush against the following paragraph.
- **No gap above the section:** the rules that give 2rem of space above a section's leading heading only matched headings that were direct children, so one wrapped in a `<header>` got none.
## The fix
- **`header` added to the block-flow margin rule** (`0.html:54`), so any header gets a 1rem bottom margin. `body > header` still overrides to 2rem.
- **`header` added to the two sectioning selectors** (`0.html:42`, `0.html:48`), so a leading `<header>` gets the same 2rem top spacing as a bare heading, and the same collapse to 0 when it directly follows a heading.
## Left as is
- **Tables:** `table { display: block }` can cost table semantics in some screen reader and browser combinations. The robust alternative is a wrapper element, which a classless stylesheet can't supply.
- **Meta description:** there is no `<meta name="description">`. The page is just a placeholder `0`, so I had nothing meaningful to write there.