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How to use emulate_media method in Playwright Python

Best Python code snippet using playwright-python

test_page.py

Source:test_page.py

...966async def test_should_emulate_reduced_motion(page, server):967    assert await page.evaluate(968        "matchMedia('(prefers-reduced-motion: no-preference)').matches"969    )970    await page.emulate_media(reduced_motion="reduce")971    assert await page.evaluate("matchMedia('(prefers-reduced-motion: reduce)').matches")972    assert not await page.evaluate(973        "matchMedia('(prefers-reduced-motion: no-preference)').matches"974    )975    await page.emulate_media(reduced_motion="no-preference")976    assert not await page.evaluate(977        "matchMedia('(prefers-reduced-motion: reduce)').matches"978    )979    assert await page.evaluate(980        "matchMedia('(prefers-reduced-motion: no-preference)').matches"981    )982async def test_input_value(page: Page, server: Server):983    await page.goto(server.PREFIX + "/input/textarea.html")984    await page.fill("input", "my-text-content")985    assert await page.input_value("input") == "my-text-content"986    await page.fill("input", "")987    assert await page.input_value("input") == ""988async def test_drag_and_drop_helper_method(page: Page, server: Server):989    await page.goto(server.PREFIX + "/drag-n-drop.html")990    await page.drag_and_drop("#source", "#target")991    assert (992        await page.eval_on_selector(993            "#target", "target => target.contains(document.querySelector('#source'))"994        )995        is True996    )997async def test_drag_and_drop_with_position(page: Page, server: Server):998    await page.goto(server.EMPTY_PAGE)999    await page.set_content(1000        """1001      <div style="width:100px;height:100px;background:red;" id="red">1002      </div>1003      <div style="width:100px;height:100px;background:blue;" id="blue">1004      </div>1005    """1006    )1007    events_handle = await page.evaluate_handle(1008        """1009        () => {1010        const events = [];1011        document.getElementById('red').addEventListener('mousedown', event => {1012            events.push({1013            type: 'mousedown',1014            x: event.offsetX,1015            y: event.offsetY,1016            });1017        });1018        document.getElementById('blue').addEventListener('mouseup', event => {1019            events.push({1020            type: 'mouseup',1021            x: event.offsetX,1022            y: event.offsetY,1023            });1024        });1025        return events;1026        }1027    """1028    )1029    await page.drag_and_drop(1030        "#red",1031        "#blue",1032        source_position={"x": 34, "y": 7},1033        target_position={"x": 10, "y": 20},1034    )1035    assert await events_handle.json_value() == [1036        {"type": "mousedown", "x": 34, "y": 7},1037        {"type": "mouseup", "x": 10, "y": 20},1038    ]1039async def test_should_check_box_using_set_checked(page: Page):1040    await page.set_content("`<input id='checkbox' type='checkbox'></input>`")1041    await page.set_checked("input", True)1042    assert await page.evaluate("checkbox.checked") is True1043    await page.set_checked("input", False)1044    assert await page.evaluate("checkbox.checked") is False1045async def test_should_set_bodysize_and_headersize(page: Page, server: Server):1046    await page.goto(server.EMPTY_PAGE)1047    async with page.expect_request("*/**") as request_info:1048        await page.evaluate(1049            "() => fetch('./get', { method: 'POST', body: '12345'}).then(r => r.text())"1050        )1051    request = await request_info.value1052    sizes = await request.sizes()1053    assert sizes["requestBodySize"] == 51054    assert sizes["requestHeadersSize"] >= 3001055async def test_should_set_bodysize_to_0(page: Page, server: Server):1056    await page.goto(server.EMPTY_PAGE)1057    async with page.expect_request("*/**") as request_info:1058        await page.evaluate("() => fetch('./get').then(r => r.text())")1059    request = await request_info.value1060    sizes = await request.sizes()1061    assert sizes["requestBodySize"] == 01062    assert sizes["requestHeadersSize"] >= 2001063@pytest.mark.skip_browser("webkit")  # https://bugs.webkit.org/show_bug.cgi?id=2252811064async def test_should_emulate_forced_colors(page):1065    assert await page.evaluate("matchMedia('(forced-colors: none)').matches")1066    await page.emulate_media(forced_colors="none")1067    assert await page.evaluate("matchMedia('(forced-colors: none)').matches")1068    assert not await page.evaluate("matchMedia('(forced-colors: active)').matches")1069    await page.emulate_media(forced_colors="active")1070    assert await page.evaluate("matchMedia('(forced-colors: active)').matches")1071    assert not await page.evaluate("matchMedia('(forced-colors: none)').matches")1072async def test_should_not_throw_when_continuing_while_page_is_closing(1073    page: Page, server: Server1074):1075    done = None1076    def handle_route(route: Route) -> None:1077        nonlocal done1078        done = asyncio.gather(route.continue_(), page.close())1079    await page.route("**/*", handle_route)1080    with pytest.raises(Error):1081        await page.goto(server.EMPTY_PAGE)1082    await done1083async def test_should_not_throw_when_continuing_after_page_is_closed(...

feedsdb.py

Source:feedsdb.py

...212                }213            }''')214        mediatype = spec.pop('mediatype', None)215        if mediatype is not None:216            await page.emulate_media(media = mediatype)217        await page.wait_for_timeout(500)218        await page.pdf(**spec)219    async def get_pdf(browser, spec):220        context_opts = dict(221            accept_downloads = True,222            java_script_enabled = False,223            color_scheme = 'light'224        )225        if 'useragent' in spec:226            context_opts['user_agent'] = spec.pop('useragent')227        if 'viewport' in spec:228            context_opts['viewport'] = spec.pop('viewport')229        context = await browser.new_context(**context_opts)230        page = await context.new_page()...

cli.py

Source:cli.py

...313        }314        if output != "-":315            kwargs["path"] = output316        if media_screen:317            page.emulate_media(media="screen")318        pdf = page.pdf(**kwargs)319        if output == "-":320            sys.stdout.buffer.write(pdf)321        else:322            click.echo(323                "Screenshot of '{}' written to '{}'".format(url, output), err=True324            )325        browser.close()326@cli.command()327def install():328    """329    Install Playwright browser needed by this tool.330    Usage:331        shot-scraper install...

main.py

Source:main.py

1import os2import sys3import shutil4import argparse5from bowler import Query6methods = [7    ("addInitScript", "add_init_script"),8    ("addScriptTag", "add_script_tag"),9    ("addStyleTag", "add_style_tag"),10    ("bringToFront", "bring_to_front"),11    ("dispatchEvent", "dispatch_event"),12    ("emulateMedia", "emulate_media"),13    ("evalOnSelector", "eval_on_selector"),14    ("evalOnSelectorAll", "eval_on_selector_all"),15    ("evaluateHandle", "evaluate_handle"),16    ("expectDownload", "expect_download"),17    ("expectFileChooser", "expect_file_chooser"),18    ("exposeBinding", "expose_binding"),19    ("exposeFunction", "expose_function"),20    ("newPage", "new_page"),21    ("newContext", "new_context"),22    ("innerHTML", "inner_html"),23    ("innerText", "inner_text"),24    ("setContent", "set_content"),25    ("setDefaultNavigationTimeout", "set_default_navigation_timeout"),26    ("setDefaultTimeout", "set_default_timeout"),27    ("setExtraHTTPHeaders", "set_extra_http_headers"),28    ("setInputFiles", "set_input_files"),29    ("setViewportSize", "set_viewport_size"),30    ("textContent", "text_content"),31    ("viewportSize", "viewport_size"),32    ("waitForEvent", "wait_for_event"),33    ("waitForFunction","wait_for_function"),34    ("waitForLoadState", "wait_for_load_state"),35    ("waitForSelector", "wait_for_selector"),36    ("querySelector", "query_selector"),37    ("querySelectorAll", "query_selector_all"),38    ("waitForTimeout","wait_for_timeout"),39]40class RefactorTool:41    def __init__(self, input, nobackups, show_diffs):42        """43        Args:44            input: path to file to be refactored.45            nobackups: If true no backup '.bak' files will be created for those46                files that are being refactored.47            show_diffs: Should diffs of the refactoring be printed to stdout?48        """49        self.nobackups = nobackups50        self.show_diffs = show_diffs51        self.fn = input52        self.query = Query([self.fn])53    def rename_methods(self):54        for old_name, new_name in methods:55            self.query.select_method(old_name).rename(new_name)56    def fix_imports(self):57        # Fix old style: from playwright import sync_playwright58        self.query.select_module("sync_playwright").select_module("playwright").rename(59            "playwright.sync_api"60        )61        pass62    def output_diffs(self):63        self.query.diff()64    def write_file(self):65        if not self.nobackups:66            # Make a backup before refactor67            backup = self.fn + ".bak"68            if os.path.lexists(backup):69                try:70                    os.remove(backup)71                except OSError as err:72                    self.log_message("Cannot remove backup %s" % backup)73            try:74                shutil.copyfile(self.fn, backup)75            except OSError as err:76                self.log_message("Cannot copy %s to %s" % (self.fn, backup))77        self.query.write()78    def log_message(self, msg):79        print("Info: " + msg)80    def log_error(self, msg):81        print("Error: " + msg)82def main(args=sys.argv[1:]):83    """Main program.84    Args:85        args: optional; a list of command line arguments. If omitted,86              sys.argv[1:] is used.87    """88    # Set up arg parser89    parser = argparse.ArgumentParser(description="Migrate playwright code to 1.8+")90    parser.add_argument(91        "--no-diffs",92        action="store_true",93        default=False,94        help="Don't show diffs of the refactoring",95    )96    parser.add_argument(97        "-n",98        "--nobackups",99        action="store_true",100        default=False,101        help="Don't write backups for modified files",102    )103    parser.add_argument(104        "-w",105        "--write",106        action="store_true",107        default=False,108        help="Write back modified files",109    )110    parser.add_argument("path", metavar="path", type=str, help="the path to the file")111    args = parser.parse_args()112    fix = RefactorTool(args.path, nobackups=False, show_diffs=(not args.no_diffs))113    fix.fix_imports()114    fix.rename_methods()115    if not args.no_diffs:116        fix.output_diffs()117    if args.write:118        fix.write_file()119if __name__ == "__main__":...

Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
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Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.