Parameters

SevenMark uses a parameter system to pass key-value data to elements.

How Parameters Work

Parameters are generic key-value pairs — the parser accepts any #key="value" without validating the key name. The parser stores all parameters in the AST, and it is up to the renderer (or postprocessor) to decide which parameter names are meaningful for each element type.

This means:

• #color, #style, #lang are not special to the parser — they are conventions used by renderers
• You can pass any parameter name and the parser will accept it
• Unknown parameters are silently ignored by the renderer (they don't cause errors)

Parameter Syntax

Parameters use #key="value" for key-value pairs, or #flag for boolean flags (presence means enabled):

{{{ #style="color:red" #size="16px" Red text }}}
{{{#list #1 #style="margin-left:20px"
[[Item 1]]
[[Item 2]]
}}}

Quoted Values

Parameter values are enclosed in double quotes. Quotes inside values can be escaped:

{{{ #style="font-family: \"Arial\", sans-serif" Text }}}

Boolean Flags

Some parameters act as flags — their presence alone enables a feature:

{{{#tex #block
\sum_{i=1}^{n} x_i
}}}

[[#youtube #id="dQw4w9WgXcQ" #autoplay #mute]]

Common Renderer Conventions

The following parameters are commonly recognized by SevenMark renderers. Remember, these are renderer conventions, not parser-level features.

Styling Parameters

Parameter	Description	Used By
#style	Inline CSS styles	Styled elements, tables, lists
#color	Text color	Styled elements
#bg_color	Background color	Styled elements
#size	Font size	Styled elements
#opacity	Opacity level	Styled elements

Element-Specific Parameters

Table Parameters

For table cells, use #x for colspan and #y for rowspan:

{{{#table
[[[[#x="2" Spans 2 columns]] [[Normal cell]]]]
[[[[#y="2" Spans 2 rows]] [[Cell 1]] [[Cell 2]]]]
[[[[Cell 3]] [[Cell 4]]]]
}}}

List Parameters

Specify list type:

{{{#list #1      // Numeric (1, 2, 3...)
{{{#list #a      // Lowercase (a, b, c...)
{{{#list #A      // Uppercase (A, B, C...)
{{{#list #i      // Roman lowercase (i, ii, iii...)
{{{#list #I      // Roman uppercase (I, II, III...)

Code Parameters

Specify programming language for syntax highlighting:

{{{#code #lang="rust"
fn main() {
    println!("Hello, world!");
}
}}}

TeX Parameters

Use #block for block-level math display:

{{{#tex #block
\sum_{i=1}^{n} x_i = x_1 + x_2 + \cdots + x_n
}}}

Parameter Combinations

Multiple parameters can be combined:

{{{ #style="border: 2px solid blue;" #color="red" #size="18px" 
Multi-styled text with border, color, and size
}}}

{{{#list #1 #style="color:green; margin-left:30px"
[[Green numbered list]]
[[With custom margin]]
}}}

Nested Parameter Usage

Parameters work in nested structures:

{{{#table #style="border-collapse:collapse"
[[[[**Header 1**]] [[*Header 2*]] [[~~Header 3~~]]]]
[[[[Simple cell]] [[{{{#code #lang="python" print("nested code") }}}]] [[List: {{{#list #a [[Item A]] [[Item B]] }}}]]]]
}}}