[功能建议] 可不可以加入标题自动编号的功能？

暂时不会加入，请关注 Issue #522 · siyuan-note/siyuan 如果有计划加入该特性的话会重开这个 issue，感谢反馈。

在主题中加入如下样式即可实现自动编号(导出为 HTML/PDF 时也能保留)

PS: 可以更改 font-size 字段调整编号的大小

body {
    counter-reset: h1-count 0;
}

h1,
.h1 {
    counter-reset: h2-count 0;
}

h2,
.h2 {
    counter-reset: h3-count 0;
}

h3,
.h3 {
    counter-reset: h4-count 0;
}

h4,
.h4 {
    counter-reset: h5-count 0;
}

h5,
.h5 {
    counter-reset: h6-count 0;
}

.protyle-wysiwyg [data-node-id].h1:before,
.b3-typography h1:before {
    display: block;
    float: left;
    font-size: 50%;
    counter-increment: h1-count;
    content: counter(h1-count) "\00A0";
}

.protyle-wysiwyg [data-node-id].h2:before,
.b3-typography h2:before {
    display: block;
    float: left;
    font-size: 50%;
    counter-increment: h2-count;
    content: counter(h1-count) "."counter(h2-count) "\00A0";
}

.protyle-wysiwyg [data-node-id].h3:before,
.b3-typography h3:before {
    display: block;
    float: left;
    font-size: 50%;
    counter-increment: h3-count;
    content: counter(h1-count) "."counter(h2-count) "."counter(h3-count) "\00A0";
}

.protyle-wysiwyg [data-node-id].h4:before,
.b3-typography h4:before {
    display: block;
    float: left;
    font-size: 50%;
    counter-increment: h4-count;
    content: counter(h1-count) "."counter(h2-count) "."counter(h3-count) "."counter(h4-count) "\00A0";
}

.protyle-wysiwyg [data-node-id].h5:before,
.b3-typography h5:before {
    display: block;
    float: left;
    font-size: 50%;
    counter-increment: h5-count;
    content: counter(h1-count) "."counter(h2-count) "."counter(h3-count) "."counter(h4-count) "."counter(h5-count) "\00A0";
}

.protyle-wysiwyg [data-node-id].h6:before,
.b3-typography h6:before {
    display: block;
    float: left;
    font-size: 50%;
    counter-increment: h6-count;
    content: counter(h1-count) "."counter(h2-count) "."counter(h3-count) "."counter(h4-count) "."counter(h5-count) "."counter(h6-count) "\00A0";
}

试了一下，不知道能否优化一下，如果为 0 就不显示。

因为一般 H1 没用到，现在 H2 就变成 0.1 开始算

可以自定义一下 content 属性中显示的内容

counter(h1-count) 就是一级标题的编号, 以此类推, 若不需要删除即可

就是想动态，比如没有 H1，就自动删除，可以吗？