Ambiguity with nested lists

[arve0]

- item
  - nested
  {.red}
{.blue}

gives

<ul>
<li>item
<ul class="blue red">
<li>nested</li>
</ul>
</li>
</ul>

and not what one might expect

<ul class="blue">
<li>item
<ul class="red">
<li>nested</li>
</ul>
</li>
</ul>

[arve0]

Syntax will be:

- in end of list item, apply to <li> {.a}
  - also for nested lists {.b}
  - newlines before {curly} will apply to nearest <ul> or <ol>
{.c}

{.d}

to force attributes to outer <ul> or <ol>, add curly by itself on a paragraph below

This gives:

<ul class="d">
<li class="a">in end of list item, apply to &lt;li&gt;
<ul class="c">
<li class="b">also for nested lists</li>
<li>newlines before {curly} will apply to nearest &lt;ul&gt; or &lt;ol&gt;</li>
</ul>
</li>
</ul>
<p>to force attributes to outer &lt;ul&gt; or &lt;ol&gt;, add curly by itself on a paragraph below</p>

I think this should be good enough for most cases, but it's not optimal. markdown-it removes preceding spaces after newline in parsing step, so one need to write a parser-plugin if one would like the format:

- item1 {apply-to=li}
  - item2 {apply-to=nested-li}
  {apply-to=nested-ul} <-- spaces before are removed in parsing, not available in token stream
{apply-to=outer-ul} <-- not possible to distinguish indentation difference from above in token stream

Complete token stream of last example:

[
  {
    "type": "bullet_list_open",
    "tag": "ul",
    "attrs": null,
    "map": [
      0,
      4
    ],
    "nesting": 1,
    "level": 0,
    "children": null,
    "content": "",
    "markup": "-",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  },
  {
    "type": "list_item_open",
    "tag": "li",
    "attrs": null,
    "map": [
      0,
      4
    ],
    "nesting": 1,
    "level": 1,
    "children": null,
    "content": "",
    "markup": "-",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  },
  {
    "type": "paragraph_open",
    "tag": "p",
    "attrs": null,
    "map": [
      0,
      1
    ],
    "nesting": 1,
    "level": 2,
    "children": null,
    "content": "",
    "markup": "",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": true
  },
  {
    "type": "inline",
    "tag": "",
    "attrs": null,
    "map": [
      0,
      1
    ],
    "nesting": 0,
    "level": 3,
    "children": [
      {
        "type": "text",
        "tag": "",
        "attrs": null,
        "map": null,
        "nesting": 0,
        "level": 0,
        "children": null,
        "content": "item1 {apply-to=li}",
        "markup": "",
        "info": "",
        "meta": null,
        "block": false,
        "hidden": false
      }
    ],
    "content": "item1 {apply-to=li}",
    "markup": "",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  },
  {
    "type": "paragraph_close",
    "tag": "p",
    "attrs": null,
    "map": null,
    "nesting": -1,
    "level": 2,
    "children": null,
    "content": "",
    "markup": "",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": true
  },
  {
    "type": "bullet_list_open",
    "tag": "ul",
    "attrs": null,
    "map": [
      1,
      4
    ],
    "nesting": 1,
    "level": 2,
    "children": null,
    "content": "",
    "markup": "-",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  },
  {
    "type": "list_item_open",
    "tag": "li",
    "attrs": null,
    "map": [
      1,
      4
    ],
    "nesting": 1,
    "level": 3,
    "children": null,
    "content": "",
    "markup": "-",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  },
  {
    "type": "paragraph_open",
    "tag": "p",
    "attrs": null,
    "map": [
      1,
      4
    ],
    "nesting": 1,
    "level": 4,
    "children": null,
    "content": "",
    "markup": "",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": true
  },
  {
    "type": "inline",
    "tag": "",
    "attrs": null,
    "map": [
      1,
      4
    ],
    "nesting": 0,
    "level": 5,
    "children": [
      {
        "type": "text",
        "tag": "",
        "attrs": null,
        "map": null,
        "nesting": 0,
        "level": 0,
        "children": null,
        "content": "item2 {apply-to=nested-li}",
        "markup": "",
        "info": "",
        "meta": null,
        "block": false,
        "hidden": false
      },
      {
        "type": "softbreak",
        "tag": "br",
        "attrs": null,
        "map": null,
        "nesting": 0,
        "level": 0,
        "children": null,
        "content": "",
        "markup": "",
        "info": "",
        "meta": null,
        "block": false,
        "hidden": false
      },
      {
        "type": "text",
        "tag": "",
        "attrs": null,
        "map": null,
        "nesting": 0,
        "level": 0,
        "children": null,
        "content": "{apply-to=nested-ul}",
        "markup": "",
        "info": "",
        "meta": null,
        "block": false,
        "hidden": false
      },
      {
        "type": "softbreak",
        "tag": "br",
        "attrs": null,
        "map": null,
        "nesting": 0,
        "level": 0,
        "children": null,
        "content": "",
        "markup": "",
        "info": "",
        "meta": null,
        "block": false,
        "hidden": false
      },
      {
        "type": "text",
        "tag": "",
        "attrs": null,
        "map": null,
        "nesting": 0,
        "level": 0,
        "children": null,
        "content": "{apply-to=outer-ul}",
        "markup": "",
        "info": "",
        "meta": null,
        "block": false,
        "hidden": false
      }
    ],
    "content": "item2 {apply-to=nested-li}\n{apply-to=nested-ul}\n{apply-to=outer-ul}",
    "markup": "",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  },
  {
    "type": "paragraph_close",
    "tag": "p",
    "attrs": null,
    "map": null,
    "nesting": -1,
    "level": 4,
    "children": null,
    "content": "",
    "markup": "",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": true
  },
  {
    "type": "list_item_close",
    "tag": "li",
    "attrs": null,
    "map": null,
    "nesting": -1,
    "level": 3,
    "children": null,
    "content": "",
    "markup": "-",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  },
  {
    "type": "bullet_list_close",
    "tag": "ul",
    "attrs": null,
    "map": null,
    "nesting": -1,
    "level": 2,
    "children": null,
    "content": "",
    "markup": "-",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  },
  {
    "type": "list_item_close",
    "tag": "li",
    "attrs": null,
    "map": null,
    "nesting": -1,
    "level": 1,
    "children": null,
    "content": "",
    "markup": "-",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  },
  {
    "type": "bullet_list_close",
    "tag": "ul",
    "attrs": null,
    "map": null,
    "nesting": -1,
    "level": 0,
    "children": null,
    "content": "",
    "markup": "-",
    "info": "",
    "meta": null,
    "block": true,
    "hidden": false
  }
]