H1: html5 outline for a nest of sections (2)

<section>

H1: Heading of section level 1

p: text of the first section

<section>

H2: Heading of section level 2

p: this section is nested in section level 1

<section>

H3: Heading 1 of section level 3

p: this section is nested in section 2

H3: Heading 2 of this section

p: also in this section 3

<section>

H4: Heading of section level 4

p: this section is nested in section level 3

<section>

H5: Heading of section level 5

p: this section is nested in section level 4

<section>

H3: Heading of a new section level 3

p: this section is also nested in section level 2

Default size of the Hx series:

H1: Heading of my size

H2: Heading of my size

H3: Heading of my size

H4: Heading of my size

H5: Heading of my size

No explicit font-size for the H1, H2 ... H5, no explicit font-size for the p.
The H1 in the first section is affected (smaller).
The headers H2, H3 ... in the nested <section>'s are renderered as H2, H3, H4, etc.!
Tested nov. 2013 in Firefox 23/24/25, Chrome 30, Opera 12.16/17, Safari-Win (5.1.7) and IE 9/10/11: all the same.
Outline according to the w3c Semantic Data Extractor:
Outline of the document
- H1: html5 outline for a nest of sections (2)
- H1: Heading of section level 1
  - H2: Heading of section level 2
    - H3: Heading 1 of section level 3
    - H3: Heading 2 of this section
      
      H4: Heading of section level 4
      
      H5: Heading of section level 5
    - H3: Heading of a new section level 3
For visitors with AT (Assistive Technologie) this is the desired outline structure.