data-help="Type on the page. Tap where the text should begin, or drag open a rectangle in which the text wraps and which grows downward as you type; its corners are marked in blue on the screen only. Tap your own text to change it; rest the pen on it to move it, or near a corner of a rectangle to resize it, or use Arrange.">Text</button>
data-help="Draw the shape named on the button, in the pen’s colour and line width. Hold the button down, or press it with the right button, for the other shapes.">Rectangle</button>
data-help="Line: tap each point of the line in turn; a drag gives its first two. Tap the last point again to finish, or the first point to close the shape. Backspace takes back the last point, Escape finishes.">Line</button>
data-help="Hide part of the page for everyone: drag open a rectangle, and what lies under it is covered in white, marked by blue corners. Rest the pen on it to move it, or near a corner to resize it, or use Arrange; a tap of the eraser removes it.">Hide</button>
data-help="Move and resize: the corners of every image are marked in blue, as those of Hides and text rectangles always are. Drag inside an image, a Hide or a text rectangle of yours to move it, drag a corner to resize it (an image keeps its shape). A press elsewhere does nothing. With any other tool, resting the pen on one of them for half a second does the same.">Arrange</button>
data-help="Erase your own strokes and text by moving over them. A tap on an image, or on a Hide rectangle, removes it, if you are the host or a co-host (or added the image yourself). Two quick taps on empty paper, away from anything the eraser would remove, undo your latest mark; again, and the one before.">Eraser</button>
</div>
<buttonid="undo"type="button"disabled
data-help="Take back your latest mark: a stroke, an erasure, a text block typed or moved, a Hide rectangle. Again for the one before. Also Ctrl+Z (Command+Z on a Mac), or two quick taps of the eraser on empty paper. Only your own marks, and only on this page since you opened it.">Undo</button>
data-help="The page and the view: fit the page to the window, show it at its normal scale, make it larger or smaller, and whether it grows as you write.">Page</button>
data-help="Show the whole page in the window. Pressed by the host, it does so on every screen. Ctrl (Command on a Mac) with the scroll wheel, or with a pen stroke up or down, zooms about the pointer.">Fit to the window</button>
data-help="Show the page at the scale a new page has, one full page filling the window. A shrunk page is then seen at its own size rather than enlarged. Pressed by the host, it does so on every screen.">Normal scale</button>
data-help="Make the page, for everyone, just large enough for what is on it, with the margin around. Nothing on it moves.">Shrink to the contents</button>
data-help="Put an image file, such as a scanned exercise, on the page for everyone: below the images already there, centred, at its own size. Rest the pen on an image to move it, or near a corner to scale it; it comes to the front. A tap of the eraser on an image removes it; writing on it stays.">Image</button>
data-help="Your notebooks and the pages kept in them, to look at or to delete. The host and co-hosts can start a new page for everyone from a kept page, with everything on it; the current page is then kept in each notebook.">Notebooks</button>
<buttonid="help"type="button"data-help="Where to read about Kokkoja. With Ctrl (Command on a Mac) held, the explanations of every command in one text.">Help</button>
<divid="help_popup"class="popup help_popup"hidden>Help is coming!</div>
