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// "Therefore those skilled at the unorthodox
// are infinite as heaven and earth,
// inexhaustible as the great rivers.
// When they come to an end,
// they begin again,
// like the days and months;
// they die and are reborn,
// like the four seasons."
//
// - Sun Tsu,
// "The Art of War"
namespace TheArtOfDev.HtmlRenderer.Core
{
internal static class CssDefaults
{
/// <summary>
/// CSS Specification's Default Style Sheet for HTML 4
/// </summary>
/// <remarks>
/// http://www.w3.org/TR/CSS21/sample.html
/// </remarks>
public const string DefaultStyleSheet = @"
html, address,
blockquote,
body, dd, div,
dl, dt, fieldset, form,
frame, frameset,
h1, h2, h3, h4,
h5, h6, noframes,
ol, p, ul, center,
dir, menu, pre { display: block }
li { display: list-item }
head { display: none }
table { display: table }
tr { display: table-row }
thead { display: table-header-group }
tbody { display: table-row-group }
tfoot { display: table-footer-group }
col { display: table-column }
colgroup { display: table-column-group }
td, th { display: table-cell }
caption { display: table-caption }
th { font-weight: bolder; text-align: center }
caption { text-align: center }
body { margin: 8px }
h1 { font-size: 2em; margin: .67em 0 }
h2 { font-size: 1.5em; margin: .75em 0 }
h3 { font-size: 1.17em; margin: .83em 0 }
h4, p,
blockquote, ul,
fieldset, form,
ol, dl, dir,
menu { margin: 1.12em 0 }
h5 { font-size: .83em; margin: 1.5em 0 }
h6 { font-size: .75em; margin: 1.67em 0 }
h1, h2, h3, h4,
h5, h6, b,
strong { font-weight: bolder; }
blockquote { margin-left: 40px; margin-right: 40px }
i, cite, em,
var, address { font-style: italic }
pre, tt, code,
kbd, samp { font-family: monospace }
pre { white-space: pre }
button, textarea,
input, select { display: inline-block }
big { font-size: 1.17em }
small, sub, sup { font-size: .83em }
sub { vertical-align: sub }
sup { vertical-align: super }
table { border-spacing: 2px; }
thead, tbody,
tfoot, tr { vertical-align: middle }
td, th { vertical-align: inherit }
s, strike, del { text-decoration: line-through }
hr { border: 1px inset; }
ol, ul, dir,
menu, dd { margin-left: 40px }
ol { list-style-type: decimal }
ol ul, ul ol,
ul ul, ol ol { margin-top: 0; margin-bottom: 0 }
ol ul, ul ul { list-style-type: circle }
ul ul ul,
ol ul ul,
ul ol ul { list-style-type: square }
u, ins { text-decoration: underline }
br:before { content: ""\A"" }
:before, :after { white-space: pre-line }
center { text-align: center }
:link, :visited { text-decoration: underline }
:focus { outline: thin dotted invert }
/* Begin bidirectionality settings (do not change) */
BDO[DIR=""ltr""] { direction: ltr; unicode-bidi: bidi-override }
BDO[DIR=""rtl""] { direction: rtl; unicode-bidi: bidi-override }
*[DIR=""ltr""] { direction: ltr; unicode-bidi: embed }
*[DIR=""rtl""] { direction: rtl; unicode-bidi: embed }
/* Ported from PeachPDF's CssDefaults (spelt with css-break-3's break-* properties rather
than the legacy page-break-* aliases - the two share their storage and initial value,
see InitialValues below, so this is the same cascade either way). Replaces this engine's
own older `h1 { page-break-before: always }` default, which forced a leading blank page
before any document that opened with a heading now that break-before is actually
consumed by layout - break-after: avoid (keep-with-next) is the behavior real print
engines give headings by default. */
@media print {
h1, h2, h3,
h4, h5, h6 { break-after: avoid }
/* css-tables-3 6.2 repeats a header or footer group across the pages a table spans only
where the group carries an avoid break-inside. */
thead, tfoot { break-inside: avoid }
}
/* Not in the specification but necessary */
a { color: #0055BB; text-decoration:underline }
table { border-color:#dfdfdf; }
td, th { border-color:#dfdfdf; overflow: hidden; }
style, title,
script, link,
meta, area,
base, param { display:none }
hr { border-top-color: #9A9A9A; border-left-color: #9A9A9A; border-bottom-color: #EEEEEE; border-right-color: #EEEEEE; }
pre { font-size: 10pt; margin-top: 15px; }
/*This is the background of the HtmlToolTip*/
.htmltooltip {
border:solid 1px #767676;
background-color:#E4E5F0;
padding: 8px;
Font: 9pt Tahoma;
}";
/// <summary>
/// The initial value of every property this engine recognizes (<see cref="Utils.CssUtils"/>'s exact
/// whitelist), used to resolve the <c>initial</c>/<c>unset</c>/<c>revert</c>/<c>revert-layer</c>
/// CSS-wide keywords in the six-phase cascade (<see cref="Parse.DomParser"/>). Deliberately matches
/// this engine's own existing field defaults (<see cref="Dom.CssBoxProperties"/>'s private field
/// initializers) rather than the CSS spec's initial values where the two differ (e.g. this engine's
/// border-color default is "black", not the spec's "currentcolor"; text-align/text-decoration/
/// list-style-image default to an empty string here, not "left"/"none"/"none") - so resolving
/// "initial" produces exactly what an unstyled box already looks like today, not a new value.
/// </summary>
internal static readonly System.Collections.Generic.Dictionary<string, string> InitialValues =
new System.Collections.Generic.Dictionary<string, string>(System.StringComparer.OrdinalIgnoreCase)
{
{ "background-color", "transparent" },
{ "background-image", "none" },
{ "background-position", "0% 0%" },
{ "background-repeat", "repeat" },
{ "border-top-width", "medium" },
{ "border-right-width", "medium" },
{ "border-bottom-width", "medium" },
{ "border-left-width", "medium" },
{ "border-top-color", "black" },
{ "border-right-color", "black" },
{ "border-bottom-color", "black" },
{ "border-left-color", "black" },
{ "border-top-style", "none" },
{ "border-right-style", "none" },
{ "border-bottom-style", "none" },
{ "border-left-style", "none" },
{ "border-spacing", "0" },
{ "border-collapse", "separate" },
{ "color", "black" },
{ "content", "normal" },
{ "border-top-left-radius", "0 0" },
{ "border-top-right-radius", "0 0" },
{ "border-bottom-right-radius", "0 0" },
{ "border-bottom-left-radius", "0 0" },
{ "empty-cells", "show" },
{ "direction", "ltr" },
{ "display", "inline" },
{ "font-size", "medium" },
{ "font-style", "normal" },
{ "font-variant", "normal" },
{ "font-weight", "normal" },
{ "font-stretch", "normal" },
{ "float", "none" },
{ "clear", "none" },
{ "box-sizing", "content-box" },
{ "height", "auto" },
{ "min-height", "0" },
{ "max-height", "none" },
{ "margin-bottom", "0" },
{ "margin-left", "0" },
{ "margin-right", "0" },
{ "margin-top", "0" },
{ "left", "auto" },
{ "line-height", "normal" },
{ "list-style-type", "disc" },
{ "list-style-image", "" },
{ "list-style-position", "outside" },
{ "list-style", "" },
{ "overflow", "visible" },
{ "padding-left", "0" },
{ "padding-bottom", "0" },
{ "padding-right", "0" },
{ "padding-top", "0" },
{ "page-break-inside", "auto" },
{ "break-inside", "auto" },
{ "break-before", "auto" },
{ "break-after", "auto" },
{ "page-break-before", "auto" },
{ "page-break-after", "auto" },
{ "widows", "2" },
{ "orphans", "2" },
{ "page", "auto" },
{ "text-align", "" },
{ "text-decoration-line", "" },
{ "text-indent", "0" },
{ "top", "auto" },
{ "position", "static" },
{ "vertical-align", "baseline" },
{ "width", "auto" },
{ "max-width", "none" },
{ "word-spacing", "normal" },
{ "word-break", "normal" },
{ "visibility", "visible" },
{ "white-space", "normal" },
};
/// <summary>
/// Properties inherited from parent to child during cascade - kept exactly in sync with the set
/// <see cref="Dom.CssBoxProperties.InheritStyle"/> already (independently) copies, since this is
/// used only to decide whether the <c>unset</c> keyword should behave like <c>inherit</c> or
/// <c>initial</c> for a given property, and the two must agree for "unset" to make sense.
/// </summary>
internal static readonly System.Collections.Generic.HashSet<string> InheritedProperties =
new System.Collections.Generic.HashSet<string>(System.StringComparer.OrdinalIgnoreCase)
{
"border-spacing", "border-collapse",
"color",
"empty-cells",
"white-space",
"visibility",
"text-indent", "text-align",
"font-family", "font-size", "font-style", "font-variant", "font-weight", "font-stretch",
"list-style-image", "list-style-position", "list-style-type", "list-style",
"line-height",
"word-break",
"direction",
"widows", "orphans",
};
/// <summary>
/// Returns the initial value for the given property name, or null if this engine doesn't
/// recognize the property at all.
/// </summary>
internal static string GetInitialValue(string propertyName)
{
string value;
return InitialValues.TryGetValue(propertyName, out value) ? value : null;
}
}
}