Nodes

The Nodes interface represents a collection of the nodes. It is similar to jQuery, but its implementation is much simpler. Its methods can be considered aliases of native DOM interfaces, designed to simplify DOM manipulation.

Example:

import { Nodes } from 'lakelib';

const body = new Nodes(document.body);
body.append('<p>foo</p>');

Constructor

Creates a new Nodes object.

• Parameters:

  node

  A native Node object or a list of native nodes.

Example:

// A native node.
const body = new Nodes(document.body);

// A list of native nodes.
const nodes = new Nodes([
  document.createElement('p'),
  document.createTextNode('foo'),
]);

Instance properties

length Read only

The number of nodes in the Nodes object.

• Type: Nodes

Example:

const nodes = new Nodes([
  document.createElement('p'),
  document.createTextNode('foo'),
]);
// Outputs 2.
console.log(nodes.length);

id Read only

The unique ID of the first node.

• Type: number

Example:

const paragraph = new Nodes(document.createElement('p'));
// Outputs a number.
console.log(paragraph.id);

name Read only

The name of the first node.

• Type: string

Example:

const paragraph = new Nodes(document.createElement('p'));
// Outputs "p".
console.log(paragraph.name);

isElement Read only

A boolean value indicating whether the first node is an element.

• Type: boolean

Example:

const paragraph = new Nodes(document.createElement('p'));
// Outputs true.
console.log(paragraph.isElement);

isText Read only

A boolean value indicating whether the first node is a text.

• Type: boolean

Example:

const textNode = new Nodes(document.createTextNode('foo'));
// Outputs true.
console.log(textNode.isText);

isBlock Read only

A boolean value indicating whether the first node is a block.

• Type: boolean

Example:

const paragraph = new Nodes(document.createElement('p'));
// Outputs true.
console.log(paragraph.isBlock);

isMark Read only

A boolean value indicating whether the first node is a mark.

• Type: boolean

Example:

const strong = new Nodes(document.createElement('strong'));
// Outputs true.
console.log(strong.isMark);

isVoid Read only

A boolean value indicating whether the first node is a void element that cannot have any child nodes.

• Type: boolean

Example:

const br = new Nodes(document.createElement('br'));
// Outputs true.
console.log(br.isVoid);

isHeading Read only

A boolean value indicating whether the first node is a heading.

• Type: boolean

Example:

const h1 = new Nodes(document.createElement('h1'));
// Outputs true.
console.log(h1.isHeading);

isList Read only

A boolean value indicating whether the first node is a list.

• Type: boolean

Example:

const ol = new Nodes(document.createElement('ol'));
// Outputs true.
console.log(ol.isList);

isTable Read only

A boolean value indicating whether the first node is a table.

• Type: boolean

Example:

const table = new Nodes(document.createElement('table'));
// Outputs true.
console.log(table.isTable);

isBookmark Read only

A boolean value indicating whether the first node is a bookmark element.

• Type: boolean

Example:

const bookmark = new Nodes(document.createElement('lake-bookmark'));
// Outputs true.
console.log(bookmark.isBookmark);

isBox Read only

A boolean value indicating whether the first node is a box element.

• Type: boolean

Example:

const boxNode = new Nodes(document.createElement('lake-box'));
// Outputs true.
console.log(boxNode.isBox);

isInlineBox Read only

A boolean value indicating whether the first node is an inline box element.

• Type: boolean

Example:

const boxNode = query('<lake-box type="inline" name="emoji"></lake-box>');
// Outputs true.
console.log(boxNode.isInlineBox);

isBlockBox Read only

A boolean value indicating whether the first node is a block box element.

• Type: boolean

Example:

const boxNode = query('<lake-box type="block" name="hr"></lake-box>');
// Outputs true.
console.log(boxNode.isBlockBox);

isContainer Read only

A boolean value indicating whether the first node is a contenteditable element where users can edit the content.

• Type: boolean

Example:

const div = query('<div contenteditable="true" />');
// Outputs true.
console.log(div.isContainer);

isOutside Read only

A boolean value indicating whether the first node does not have an ancestor element which contenteditable attribute is true.

• Type: boolean

Example:

const div = query('<div><div contenteditable="true" /></div>');
// Outputs true.
console.log(div.isOutside);

isInside Read only

A boolean value indicating whether the first node has an ancestor element which contenteditable attribute is true.

• Type: boolean

Example:

const div = query('<div contenteditable="true"><p>foo</p></div>');
// Outputs true.
console.log(div.find('p').isInside);

isTopInside Read only

A boolean value indicating whether the parent of the first node is an element which contenteditable attribute is true.

• Type: boolean

Example:

const div = query('<div contenteditable="true"><p>foo</p></div>');
// Outputs true.
console.log(div.find('p').isTopInside);

isContentEditable Read only

A boolean value indicating whether the first node is editable.

• Type: boolean

Example:

const div = query('<div contenteditable="true"><p>foo</p></div>');
// Outputs true.
console.log(div.find('p').isContentEditable);

isIndivisible Read only

A boolean value indicating whether the first node is indivisible.

• Type: boolean

Example:

const div = query('<div contenteditable="true" />');
// Outputs true.
console.log(div.isIndivisible);

isEmpty Read only

A boolean value indicating whether the first node is empty.

• Type: boolean

Example:

const div = query('<div><p></p></div>');
// Outputs true.
console.log(div.find('p').isEmpty);

Instance methods

get()

Returns a native Node object at the specified index.

• Parameters:

  index

  Zero-based index of the native node to be returned.

• Return value:

  A Node object.

Example:

const paragraphs = query('<p>foo</p><p>bar</p>');
// Outputs "foo".
console.log(paragraphs.get(0).innerText);
// Outputs "bar".
console.log(paragraphs.get(1).innerText);

getAll()

Returns all native nodes.

• Parameters:

  None.

• Return value:

  An Array object that contains Node objects.

Example:

const paragraphs = query('<p>foo</p><p>bar</p>');
const nativeNodes = paragraphs.getAll();
// Outputs "foo".
console.log(nativeNodes[0].innerText);
// Outputs "bar".
console.log(nativeNodes[1].innerText);

eq()

Returns a new Nodes object that includes only the node at the specified index.

• Parameters:

  index

  Zero-based index of the specified node.

• Return value:

  A Nodes object.

Example:

const paragraphs = query('<p>foo</p><p>bar</p>');
// Outputs "foo".
console.log(paragraphs.eq(0).get(0).innerText);
// Outputs "bar".
console.log(paragraphs.eq(1).get(0).innerText);

each()

Executes a provided function once for each node.

• Parameters:

  callback

  A function to execute for each node in the Nodes object. If the return value is false, the iteration will be stopped. The function is called with the following arguments:

  • node: The current native node being processed.

  • index: The index of the current native node being processed.

• Return value:

  this object.

Example:

const paragraphs = query('<p>foo</p><p>bar</p>');
// Outputs the following:
// "foo", 0
// "bar", 1
paragraphs.each((node, index) => {
  console.log(node.innerText, index);
});

eachElement()

Executes a provided function once for each element.

• Parameters:

  callback

  A function to execute for each element in the Nodes object. If the return value is false, the iteration will be stopped. The function is called with the following arguments:

  • element: The current native element being processed.

  • index: The index of the current native element being processed.

• Return value:

  this object.

Example:

const div = query('<div><p>foo</p>text<p>bar</p></div>');
const children = div.children();
// Outputs 3.
console.log(children.length);
// Outputs the following:
// "foo", 0
// "bar", 2
children.eachElement((element, index) => {
  console.log(element.innerText, index);
});

reverse()

Returns a new Nodes object with the nodes in reversed order.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const paragraphs = query('<p>foo</p><p>bar</p>');
const reversedParagraphs = paragraphs.reverse();
// Outputs "bar".
console.log(reversedParagraphs.eq(0).get(0).innerText);
// Outputs "foo".
console.log(reversedParagraphs.eq(1).get(0).innerText);

matches()

Tests whether the first node would be selected by the specified CSS selector.

• Parameters:

  selector

  A string that specifies a CSS selector to test.

• Return value:

  true if the first node matches the selector. false if not.

Example:

const div = query('<div class="foo" />');
// Outputs true.
console.log(div.matches('.foo'));

contains()

Returns a boolean value indicating whether the first node is a descendant of a given node, that is the first node itself, one of its direct children (childNodes), one of the children's direct children, and so on.

• Parameters:

  otherNode

  A Nodes object to test with.

• Return value:

  true if otherNode is contained in the first node. false if not.

Example:

const div = query('<div><p>foo</p></div>');
const paragraph = div.find('p');
// Outputs true.
console.log(div.contains(paragraph));

isSibling()

Returns a boolean value indicating whether the first node and a given node are siblings.

• Parameters:

  otherNode

  A Nodes object to test with.

• Return value:

  true if the first node and otherNode are siblings. false if not.

Example:

const div = query('<div><p>foo</p><p>bar</p></div>');
const paragraphs = div.find('p');
const foo = paragraphs.eq(0);
const bar = paragraphs.eq(1);
// Outputs true.
console.log(foo.isSibling(bar));

find()

Returns the descendants of the first node that match the specified CSS selector or node path.

• Parameters:

  selector

  A string that specifies CSS selector. A NodePath that specifies node path.

• Return value:

  A Nodes object.

Example:

const div = query('<div><p>foo</p><p>bar<strong>bold</strong></p></div>');
// Outputs "bold".
console.log(div.find('strong').get(0).innerText);
// Outputs "bold".
console.log(div.find([1, 1]).get(0).innerText);

closest()

Traverses the first node and its parents (heading toward the document root) until it finds an element that matches the specified CSS selector.

• Parameters:

  selector

  A string that specifies CSS selector.

• Return value:

  A Nodes object.

Example:

const div = query('<div><p>foo</p><p>bar<strong>bold</strong></p></div>');
const paragraph = div.find('strong').closest('p');
// Outputs "bar<strong>bold</strong>".
console.log(paragraph.get(0).innerHTML);

closestBlock()

Traverses the first node and its parents until it finds a block element.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const div = query('<div contenteditable="true"><p>foo</p>bar</div>');
// Outputs "p".
const foo = div.find('p').first();
console.log(foo.closestBlock().name);
// Outputs 0.
const bar = div.find('p').next();
console.log(bar.closestBlock().length);

closestOperableBlock()

Traverses the first node and its parents until it finds an operable block.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const div = query('<div contenteditable="true"><ul><li><strong>foo</strong>bar</li></ul></div>');
// Outputs "ul".
console.log(div.find('strong').closestOperableBlock().name);

closestContainer()

Traverses the first node and its parents until it finds a div element which contenteditable attribute is true.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const div = query('<div contenteditable="true"><p>foo</p>bar</div>');
// Outputs "div".
console.log(div.find('p').closestContainer().name);

closestScroller()

Traverses the first node and its parents until it finds an element which can scroll.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const div = query('<div style="overflow: auto;"><p>foo</p>bar</div>');
// Outputs "div".
console.log(div.find('p').closestScroller().name);

parent()

Returns the parent of the first node.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const div = query('<div><p>foo</p>bar</div>');
// Outputs "div".
console.log(div.find('p').parent().name);
// Outputs 0.
console.log(div.parent().length);

prev()

Returns the immediately preceding sibling of the first node.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const div = query('<div><h1>foo</h1><p>bar</p></div>');
// Outputs "h1".
console.log(div.find('p').prev().name);
// Outputs 0.
console.log(div.find('h1').prev().length);

next()

Returns the immediately following sibling of the first node.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const div = query('<div><h1>foo</h1><p>bar</p></div>');
// Outputs "p".
console.log(div.find('h1').next().name);
// Outputs 0.
console.log(div.find('p').next().length);

first()

Returns the first child of the first node.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const div = query('<div><h1>foo</h1><p></p></div>');
// Outputs "h1".
console.log(div.first().name);
// Outputs 0.
console.log(div.find('p').first().length);

last()

Returns the last child of the first node.

• Parameters:

  None.

• Return value:

  A Nodes object.

Example:

const div = query('<div><h1>foo</h1><p></p></div>');
// Outputs "p".
console.log(div.last().name);
// Outputs 0.
console.log(div.find('p').last().length);

index()

Returns a number indicating the position of the first node relative to its sibling nodes.

• Parameters:

  None.

• Return value:

  A number indicating zero-based index.

Example:

const div = query('<div><h1>foo</h1><p>bar</p></div>');
// Outputs 0.
console.log(div.find('h1').index());
// Outputs 1.
console.log(div.find('p').index());

path()

Returns the path of the first node.

• Parameters:

  None.

• Return value:

  A NodePath indicating node path.

Example:

const div = query('<div><p>foo</p><p>bar<strong>bold</strong></p></div>');
// Outputs [1, 1].
console.log(div.find('strong').path());

children()

Returns a list which contains all of the child nodes of the first node.

• Parameters:

  None.

• Return value:

  An Array that contains Nodes objects.

Example:

const div = query('<div><h1>foo</h1><p>bar</p></div>');
const childNodes = div.children();
// Outputs "h1".
console.log(childNodes[0].name);
// Outputs "p".
console.log(childNodes[1].name);

getWalker()

Returns a generator that iterates over the descendants of the first node.

• Parameters:

  None.

• Return value:

  A Generator object.

Example:

const div = query('<div><h1>foo</h1><p>bar</p></div>');
for (const child of div.getWalker()) {
  console.log(child);
}

on()

Sets up an event listener for each element.

• Parameters:

  type

  A string representing the event type to listen for.

  listener

  A function representing the event handler.

• Return value:

  this object.

Example:

const div = query('<div><p>foo</p><p>bar</p></div>');
div.find('p').on('click', event => {
  console.log(event);
});

off()

Removes event listeners previously registered with on() method.

• Parameters:

  type Optional

  A string which specifies the type of event for which to remove event listeners.

  listener Optional

  A function representing the event handler to remove from event targets.

• Return value:

  this object.

Example:

const div = query('<div>foo</div>');
const clickListener1 = () => {
  console.log('click');
};
const clickListener2 = () => {
  console.log('click');
};
const mousedownListener = () => {
  console.log('mousedown');
};
div.on('click', clickListener1);
div.on('click', clickListener2);
div.on('mousedown', mousedownListener);
// Removes clickListener1.
div.off('click', clickListener1);
// Removes clickListener1 and clickListener2.
div.off('click');
// Removes all event listeners.
div.off();

emit()

Executes all event listeners attached to all nodes for the given event type.

• Parameters:

  type

  A string that specifies the type of the event.

  event Optional

  An Event object.

• Return value:

  this object.

Example:

const div = query('<div>foo</div>');
div.on('click', event => {
  console.log(event);
};);
// no event parameter
div.emit('click');
// with event parameter
div.emit('click', new Event('click'));

getEventListeners()

Returns all event listeners attached to the node at the specified index.

• Parameters:

  index

  Zero-based index of the node.

• Return value:

  An Array that contains event listeners.

Example:

const div = query('<div>foo</div>');
const clickListener1 = () => {
  console.log('click');
};
const clickListener2 = () => {
  console.log('click');
};
const mousedownListener = () => {
  console.log('mousedown');
};
div.on('click', clickListener1);
div.on('click', clickListener2);
div.on('mousedown', mousedownListener);
console.log(div.getEventListeners(0));

focus()

Sets focus on the specified node, if it can be focused.

• Parameters:

  None.

• Return value:

  this object.

Example:

const div = query('<div contenteditable="true"><p>foo</p></div>');
div.focus();

blur()

Removes focus from the specified node.

• Parameters:

  None.

• Return value:

  this object.

Example:

const div = query('<div contenteditable="true"><p>foo</p></div>');
div.blur();

clone()

Returns a copy of the first node. If deep is true, the copy also includes the node's descendants.

• Parameters:

  deep Optional

  A boolean value indicating whether the copy includes the node's descendants. Default value is false.

• Return value:

  A Nodes object.

Example:

const div = query('<div>foo</div>');
// without descendants
const newDiv1 = div.clone();
// with descendants
const newDiv2 = div.clone(true);

hasAttr()

Returns a boolean value indicating whether the first node has the specified attribute or not.

• Parameters:

  attributeName

  A string representing the name of the attribute.

• Return value:

  true if the first node has the specified attribute, and false otherwise.

Example:

const div = query('<div foo="1">bar</div>');
// Outputs true.
console.log(div.hasAttr('foo'));

attr()

Returns the value of the specified attribute from the first node, or sets the values of attributes for all elements.

• Parameters:

  attributeName

  A string representing the name of the attribute. This parameter can be a key-value object used to set multiple attributes.

  value Optional

  A string representing the value of the attribute.

• Return value:

  The value of the attribute if the attributeName is a string and the value is not given, this object otherwise.

Example:

const div = query('<div foo="1">bar</div>');
// Outputs "1".
console.log(div.attr('foo'));
// Sets an attribute.
div.attr('foo', '2');
// Sets multiple attributes.
div.attr({
  class: 'my-class',
  foo: '3',
});

removeAttr()

Removes the attribute with the specified name from every element.

• Parameters:

  attributeName

  A string representing the name of the attribute.

• Return value:

  this object.

Example:

const div = query('<div foo="1">bar</div>');
div.removeAttr('foo');

hasClass()

Returns a boolean value indicating whether the first node has the specified class or not.

• Parameters:

  className

  A string representing the name of the class.

• Return value:

  true if the first node has the specified class, and false otherwise.

Example:

const div = query('<div class="foo bar">text</div>');
// Outputs true.
console.log(div.hasClass('foo'));

addClass()

Adds the given class to every element.

• Parameters:

  className

  A string representing the name of the class. This parameter can be an Array used to set multiple classes.

• Return value:

  this object.

Example:

const div = query('<div>text</div>');
// Adds a class.
div.addClass('foo');
// Adds two classes.
div.addClass(['foo', 'bar']);

removeClass()

Removes the given class from every element.

• Parameters:

  className

  A string representing the name of the class. This parameter can be an Array used to set multiple classes.

• Return value:

  this object.

Example:

const div = query('<div class="foo bar">text</div>');
// Removes a class.
div.removeClass('foo');
// Removes two classes.
div.removeClass(['foo', 'bar']);

computedCSS()

Returns the value of the given CSS property of the first node, after applying active stylesheets and resolving any basic computation this value may contain.

• Parameters:

  propertyName

  A string representing the name of the CSS property.

• Return value:

  The value of the CSS property.

Example:

const div = query('<div>text</div>');
const color = div.computedCSS('color');

css()

Returns the value of the given CSS property of the first node, or sets the values of CSS properties for all elements.

• Parameters:

  propertyName

  A string representing the name of the CSS property. This parameter can be a key-value object used to set multiple CSS properties.

  value Optional

  A string representing the value of the CSS property. If the value is empty, the CSS property will be removed.

• Return value:

  The value of the CSS property if the propertyName is a string and the value is not given, this object otherwise.

Example:

const div = query('<div style="color: #1f1f1f;">foo</div>');
// Outputs "#1f1f1f".
console.log(div.css('color'));
// Sets a CSS property.
div.css('color', '#f0f0f0');
// Sets multiple CSS properties.
div.css({
  color: '#f0f0f0',
  'font-size': '16px',
});
// Removes a CSS property.
div.css('color', '');

width()

Returns the width of of the first node.

• Parameters:

  None.

• Return value:

  A number indicating the width.

Example:

const div = query('<div>text</div>');
const width = div.width();

innerWidth()

Returns the interior width of the first node, which does not include padding.

• Parameters:

  None.

• Return value:

  A number indicating the width.

Example:

const div = query('<div>text</div>');
const width = div.innerWidth();

height()

Returns the height of of the first node.

• Parameters:

  None.

• Return value:

  A number indicating the height.

Example:

const div = query('<div>text</div>');
const height = div.height();

show()

Displays all nodes.

• Parameters:

  displayType Optional

  A string representing the value of the display CSS property. Default value is block.

• Return value:

  this object.

Example:

const div = query('<div style="display: none;">foo</div>');
// Sets the "display" CSS property to "block".
div.show();
// Sets the "display" CSS property to "flex".
div.show('flex');

hide()

Hides all nodes.

• Parameters:

  None.

• Return value:

  this object.

Example:

const div = query('<div>foo</div>');
div.hide();

html()

Returns the HTML string contained within the first node, or sets the HTML string for all elements.

• Parameters:

  value Optional

  A string representing the HTML string.

• Return value:

  The HTML string if the value is not given. this object if not.

Example:

const div = query('<div><p>foo</p></div>');
// Outputs "<p>foo</p>".
console.log(div.html());
// Sets inner HTML.
div.html('<p>bar</p>');

text()

Returns the rendered text content of the first node, or sets the rendered text content for all elements.

• Parameters:

  value Optional

  A string representing the rendered text content.

• Return value:

  The rendered text content if the value is not given. this object if not.

Example:

const div = query('<div><p>foo</p></div>');
// Outputs "foo".
console.log(div.text());
// Sets inner text.
div.text('bar');

value()

Returns the value of the first node, which must be an input element, or sets the value for all input elements.

• Parameters:

  value Optional

  A string representing the value of the input element.

• Return value:

  The value of the input element if the value is not given. this object if not.

Example:

const input = query('<input type="text" />');
input.value('foo');
// Outputs "foo".
console.log(input.value());

outerHTML()

Returns the HTML string describing the first node including its descendants.

• Parameters:

  None.

• Return value:

  An HTML string.

Example:

const div = query('<div>foo</div>');
// Outputs "<div>foo</div>".
console.log(div.outerHTML());

empty()

Removes all child nodes for each element.

• Parameters:

  None.

• Return value:

  this object.

Example:

const div = query('<div>foo</div>');
div.empty();
// Outputs "<div></div>".
console.log(div.outerHTML());

prepend()

Inserts the specified content just inside the first node, before its first child.

• Parameters:

  content

  HTML string, Node, DocumentFragment, and Nodes object.

• Return value:

  this object.

Example:

const div = query('<div><p>foo</p></div>');
div.prepend('<p>bar</p>');
// Outputs "<p>bar</p><p>foo</p>".
console.log(div.html());

append()

Inserts the specified content just inside the first node, after its last child.

• Parameters:

  content

  HTML string, Node, DocumentFragment, and Nodes object.

• Return value:

  this object.

Example:

const div = query('<div><p>foo</p></div>');
div.append('<p>bar</p>');
// Outputs "<p>foo</p><p>bar</p>".
console.log(div.html());

before()

Inserts the specified content before the first node.

• Parameters:

  content

  HTML string, Node, DocumentFragment, and Nodes object.

• Return value:

  this object.

Example:

const div = query('<div><p>foo</p></div>');
div.find('p').before('<p>bar</p>');
// Outputs "<p>bar</p><p>foo</p>".
console.log(div.html());

after()

Inserts the specified content after the first node.

• Parameters:

  content

  HTML string, Node, DocumentFragment, and Nodes object.

• Return value:

  this object.

Example:

const div = query('<div><p>foo</p></div>');
div.find('p').after('<p>bar</p>');
// Outputs "<p>foo</p><p>bar</p>".
console.log(div.html());

replaceWith()

Replaces the first node with the given new content.

• Parameters:

  newContent

  HTML string, Node, and Nodes object.

• Return value:

  this object.

Example:

const div = query('<div><p>foo</p></div>');
div.find('p').replaceWith('<p>bar</p>');
// Outputs "<p>bar</p>".
console.log(div.html());

remove()

Removes all nodes from the DOM.

• Parameters:

  keepChildren Optional

  A boolean value indicating whether the node's descendants is removed. Default value is false.

• Return value:

  this object.

Example:

const div = query('<div><p>foo</p></div>');
div.find('p').remove();
// Outputs "<div></div>".
console.log(div.outerHTML());

splitText()

Splits the first node, which must be a text node, into two nodes at the specified offset, keeping both as siblings in the tree.

• Parameters:

  offset

  The index immediately before which to split the text node.

• Return value:

  A Nodes object representing the newly created text node that contains the text after the specified offset point.

Example:

const node = new Nodes(document.createTextNode('foobar'));
const newNode = node.splitText(3);
// Outputs "foo".
console.log(node.text()));
// Outputs "bar".
console.log(newNode.text()));

toString()

Returns information about the first node, which is used for debugging.

• Parameters:

  None.

• Return value:

  A string representing information about the first node.

Example:

const body = new Nodes(document.body);
console.log(body.toString()));

info()

Prints information about the first node, which is used for debugging.

• Parameters:

  None.

• Return value:

  None.

Example:

const body = new Nodes(document.body);
body.info();