Summary should be visible from start

[Soreine]

Currently, the Summary is hidden at start (CSS property left: -300px), and then is displayed through JavaScript.
We could do the other way around. The Summary would be visible from the start and hidden with JavaScript if needed.

This would have two advantages:

• The Summary would not "flash" into the page after loading, in the common case where the user wants the Summary to be visible.
• User with JavaScript disabled would still be able to access the, mostly static, content of the book.

[SamyPesse]

Summary is hidden by default so that it works well on mobile.

We can maybe make a mix of both solutions to avoid flashing on mobile and desktop.

[jpreynat]

This is actually already taken care of in the sidebar module:

function init() {
    // Init last state if not mobile
    if (!platform.isMobile()) {
        toggleSidebar(gitbook.storage.get('sidebar', true), false);
    }
    // ...

[Soreine]

Re-opening issue since @jpreynat misunderstood the issue :)

[Mackiovello]

This is indeed quite annoying. If I understand the issue correctly, this is the slight visual glitch that occurs by having the sidebar hidden by default:

If this is not going to be fixed, how is it possible to modify the default theme for your own GitBook? Modifying styling and the header is no problem, not quite sure if it's possible to modify the JavaScript, though.

[Mackiovello]

Do we have an update on this? It is quite an ugly glitch that would be easy to fix.