html css javaScript

Hi Mustapha. Here is my observation:

HTML

• the first heading of a site should be an h1 element and the heading elements should follow a sequential order without skipping headings. Hence the h3 cannot be the first heading element.
• use semantic elements , where interaction is involved do not use elements such as p, div, span etc . The theme should have been radio buttons not p elements and the calculator should have buttons not span elements. Currently your calculator cannot be used by keyboard users.

js

• a calculator should have a maximum limit of numbers that it can take not one that can take an number that a user can punch in.
• I do not expect a calculator to accept the following

1. .........56666
2. 3.×3++++++---
3. undefined26++98 Press equal sign first

• try the following calculations 0.2 + 0.1