This is the style suggestion given by the w3c organization to html4 , but unfortunately, browsers all add their own private attributes, making the standard a cloud. But it is still very meaningful for us.
Appendix D. Default style sheet for HTML 4
This appendix is informative, not normal.
This style sheet describes the typical formatting of all HTML 4 ([HTML4]) elements based on extensive research into current UA practice. Developers are encouraged to use it as a default style sheet in their implementations.
The full presentation of some HTML elements cannot be expressed in CSS 2.1, including replaced elements (img, object), scripting elements (script, applet), form control elements, and frame elements.
For other elements, the legacy presentation can be described in CSS but the solution removes the element. For example, the FONT element can be replaced by attaching CSS declarations to other elements (eg, DIV). Likewise, legacy presentation of presentational attributes (eg, the border attribute on TABLE) can be described in CSS, but the markup in the source document must be changed.
Appendix D. Default style sheet for HTML 4html,address,blockquote,
body,dd,div,
dl,dt,fieldset,form,
frame,frameset,
h1,h2,h3,h4,
h5,h6,noframes,
ol,p,ul,center,
dir,hr,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 :.67em0}
h2{ font-size :1.5em; margin :.75em0}
h3{ font-size :1.17em; margin :.83em0}
h4,p,
blockquote,ul,
fieldset,form,
ol,dl,dir,
menu{ margin :1.12em0}
h5{ font-size :.83em; margin :1.5em0}
h6{ font-size :.75em; margin :1.67em0}
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{ vertical-align :middle}
td,th,tr{ vertical-align :inherit}
s,strike,del{ text-decoration :line-through}
hr{ border :1pxinset}
ol,ul,dir,
menu,dd{ margin-left :40px}
ol{ list-style-type :decimal}
olul,ulol,
ulul,olol{ margin-top :0; margin-bottom :0}
u,ins{ text-decoration :underline}
br:before{ content :/A; white-space :pre-line}
center{ text-align :center}
:link,:visited{ text-decoration :underline}
:focus{ outline :thindottedinvert}
/*Beginbidirectionalitysettings(donotchange)*/
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}
@mediaprint{
h1{ page-break-before :always}
h1,h2,h3,
h4,h5,h6{ page-break-after :avoid}
ul,ol,dl{ page-break-before :avoid}
}